diff --git a/configs-examples/full.yaml b/configs-examples/full.yaml
index 85382c8..f5f479b 100644
--- a/configs-examples/full.yaml
+++ b/configs-examples/full.yaml
@@ -2,6 +2,7 @@
 suspend_unused_vms: false
 results_storage: /var/wally_results
 var_dir_root: /tmp/perf_tests
+settings_dir: ~/.wally
 discover: fuel_openrc_only
 collect_info: false
 suspend_unused_vms: true
diff --git a/requirements.txt b/requirements.txt
index 62fa724..ea91948 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,3 +12,7 @@
 pycrypto
 ecdsa
 psutil
+python-novaclient
+python-cinderclient
+python-keystoneclient
+python-glanceclient
diff --git a/requirements_extra.txt b/requirements_extra.txt
new file mode 100644
index 0000000..a2a3828
--- /dev/null
+++ b/requirements_extra.txt
@@ -0,0 +1,2 @@
+oktest
+iso8601==0.1.10
\ No newline at end of file
diff --git a/scripts/install.sh b/scripts/install.sh
index c767b3d..3dfeef7 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -7,24 +7,20 @@
 popd > /dev/null
 
 function install_apt() {
-    apt-get install -y python-openssl python-novaclient python-cinderclient \
-                       python-keystoneclient python-glanceclient python-faulthandler \
-                       python-pip
-
+    MODULES="python-openssl  python-faulthandler python-pip"
     if [ "$FULL" == "--full" ] ; then
-        apt-get install -y python-scipy python-numpy python-matplotlib python-psutil
+        MODULES="$MODULES python-scipy python-numpy python-matplotlib python-psutil"
     fi
+    apt-get install -y $MODULES
 }
 
 
 function install_yum() {
-    yum -y install pyOpenSSL python-novaclient python-cinderclient \
-                   python-keystoneclient python-glanceclient \
-                   python-pip python-ecdsa
-
+    MODULES="pyOpenSSL python-pip python-ecdsa"
     if [ "$FULL" == "--full" ] ; then
-        yum -y install scipy numpy python-matplotlib python-psutil
+        MODULES="$MODULES scipy numpy python-matplotlib python-psutil"
     fi
+    yum -y install $MODULES
 }
 
 if which apt-get >/dev/null; then
@@ -33,7 +29,7 @@
     if which yum >/dev/null; then
         install_yum
     else
-        echo "Error: Neither apt-get, not yum installed. Can't install deps"
+        echo "Error: Neither apt-get, not yum installed. Can't install binary dependencies."
         exit 1
     fi
 fi
@@ -41,5 +37,5 @@
 pip install -r "$SCRIPTPATH/../requirements.txt"
 
 if [ "$FULL" == "--full" ] ; then
-    pip install oktest iso8601==0.1.10
+    pip install -r "$SCRIPTPATH/../requirements_extra.txt"
 fi
diff --git a/wally/config.py b/wally/config.py
index 59db0e1..cac4acf 100644
--- a/wally/config.py
+++ b/wally/config.py
@@ -1,14 +1,11 @@
 from typing import Any, Dict
-from .storage import IStorable, IStorage
+from .storage import IStorable
 
-class NoData:
-    @classmethod
-    def get(cls: type, name: str, x: Any) -> type:
-        return cls
+ConfigBlock = Dict[str, Any]
 
 
 class Config(IStorable):
-    # for mypy only
+    # make mypy happy
     run_uuid = None  # type: str
     storage_url = None  # type: str
     comment = None  # type: str
@@ -18,11 +15,13 @@
     build_id = None  # type: str
     build_description = None  # type: str
     build_type = None  # type: str
+    default_test_local_folder = None  # type: str
+    settings_dir = None  # type: str
 
-    def __init__(self, dct: Dict[str, Any]) -> None:
+    def __init__(self, dct: ConfigBlock) -> None:
         self.__dict__['_dct'] = dct
 
-    def get(self, path: str, default: Any = NoData) -> Any:
+    def get(self, path: str, default: Any = None) -> Any:
         curr = self
 
         while path:
@@ -53,8 +52,5 @@
     def __setattr__(self, name: str, val: Any):
         self.__dct[name] = val
 
-
-class Context:
-    def __init__(self, config: Config, storage: IStorage):
-        self.config = config
-        self.storage = storage
\ No newline at end of file
+    def __contains__(self, name: str) -> bool:
+        return self.get(name) is not None
diff --git a/wally/discover/discover.py b/wally/discover/discover.py
index 233650e..d1eb9ac 100644
--- a/wally/discover/discover.py
+++ b/wally/discover/discover.py
@@ -8,7 +8,7 @@
 from . import openstack
 from ..utils import parse_creds, StopTestError
 from ..test_run_class import TestRun
-from ..node import Node, NodeInfo
+from ..node import Node
 
 
 logger = logging.getLogger("wally.discover")
diff --git a/wally/hw_info.py b/wally/hw_info.py
index 4f21314..812921e 100644
--- a/wally/hw_info.py
+++ b/wally/hw_info.py
@@ -4,7 +4,7 @@
 from typing import List, Tuple
 
 from . import utils
-from .interfaces import IRemoteNode
+from .node_interfaces import IRPCNode
 
 
 def get_data(rr: str, data: str) -> str:
@@ -115,7 +115,7 @@
         self.ceph_version = None  # type: str
 
 
-def get_sw_info(node: IRemoteNode) -> SWInfo:
+def get_sw_info(node: IRPCNode) -> SWInfo:
     res = SWInfo()
 
     res.OS_version = utils.get_os(node)
@@ -128,7 +128,7 @@
     return res
 
 
-def get_hw_info(node: IRemoteNode) -> HWInfo:
+def get_hw_info(node: IRPCNode) -> HWInfo:
     res = HWInfo()
     lshw_out = node.run('sudo lshw -xml 2>/dev/null', nolog=True)
 
diff --git a/wally/inode.py b/wally/inode.py
deleted file mode 100644
index 7851a4a..0000000
--- a/wally/inode.py
+++ /dev/null
@@ -1,61 +0,0 @@
-import abc
-from typing import Set, Dict, Optional
-
-from .ssh_utils import parse_ssh_uri
-from . import hw_info
-from .interfaces import IRemoteNode, IHost
-
-
-class FuelNodeInfo:
-    """FUEL master node additional info"""
-    def __init__(self,
-                 version: str,
-                 fuel_ext_iface: str,
-                 openrc: Dict[str, str]) -> None:
-
-        self.version = version  # type: str
-        self.fuel_ext_iface = fuel_ext_iface  # type: str
-        self.openrc = openrc  # type: Dict[str, str]
-
-
-class NodeInfo:
-    """Node information object"""
-    def __init__(self,
-                 ssh_conn_url: str,
-                 roles: Set[str],
-                 bind_ip: str = None,
-                 ssh_key: str = None) -> None:
-        self.ssh_conn_url = ssh_conn_url  # type: str
-        self.roles = roles  # type: Set[str]
-
-        if bind_ip is None:
-            bind_ip = parse_ssh_uri(self.ssh_conn_url).host
-
-        self.bind_ip = bind_ip  # type: str
-        self.ssh_key = ssh_key  # type: Optional[str]
-
-
-class INode(IRemoteNode, metaclass=abc.ABCMeta):
-    """Node object"""
-
-    def __init__(self, node_info: NodeInfo):
-        IRemoteNode.__init__(self)
-        self.node_info = node_info  # type: NodeInfo
-        self.hwinfo = None  # type: hw_info.HWInfo
-        self.swinfo = None  # type: hw_info.SWInfo
-        self.os_vm_id = None  # type: str
-        self.ssh_conn = None  # type: IHost
-        self.ssh_conn_url = None  # type: str
-        self.rpc_conn = None
-        self.rpc_conn_url = None  # type: str
-
-    @abc.abstractmethod
-    def __str__(self):
-        pass
-
-    def __repr__(self):
-        return str(self)
-
-    @abc.abstractmethod
-    def node_id(self) -> str:
-        pass
diff --git a/wally/interfaces.py b/wally/interfaces.py
deleted file mode 100644
index d87c753..0000000
--- a/wally/interfaces.py
+++ /dev/null
@@ -1,81 +0,0 @@
-import abc
-from typing import Any, Set, Dict
-
-
-class IRemoteShell(metaclass=abc.ABCMeta):
-    @abc.abstractmethod
-    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
-        pass
-
-
-class IHost(IRemoteShell, metaclass=abc.ABCMeta):
-    @abc.abstractmethod
-    def get_ip(self) -> str:
-        pass
-
-    @abc.abstractmethod
-    def __str__(self) -> str:
-        pass
-
-    @abc.abstractmethod
-    def put_to_file(self, path: str, content: bytes) -> None:
-        pass
-
-
-class IRemoteFS(metaclass=abc.ABCMeta):
-    @abc.abstractmethod
-    def copy_file(self, local_path: str, remote_path: str = None) -> str:
-        pass
-
-    @abc.abstractmethod
-    def get_file_content(self, path: str) -> bytes:
-        pass
-
-    @abc.abstractmethod
-    def put_to_file(self, path:str, content: bytes) -> None:
-        pass
-
-    @abc.abstractmethod
-    def forward_port(self, ip: str, remote_port: int, local_port: int = None) -> int:
-        pass
-
-    @abc.abstractmethod
-    def get_interface(self, ip: str) -> str:
-        pass
-
-    @abc.abstractmethod
-    def stat_file(self, path:str) -> Any:
-        pass
-
-
-class IRPC(metaclass=abc.ABCMeta):
-    pass
-
-
-class IRemoteNode(IRemoteFS, IRemoteShell, metaclass=abc.ABCMeta):
-
-    def __init__(self) -> None:
-        self.roles = set()  # type: Set[str]
-        self.rpc = None  # type: IRPC
-        self.rpc_params = None  # type: Dict[str, Any]
-
-    @abc.abstractmethod
-    def is_connected(self) -> bool:
-        pass
-
-    @abc.abstractmethod
-    def disconnect(self) -> None:
-        pass
-
-    @abc.abstractmethod
-    def connect_ssh(self, timeout: int = None) -> None:
-        pass
-
-    @abc.abstractmethod
-    def get_ip(self) -> str:
-        pass
-
-    @abc.abstractmethod
-    def get_user(self) -> str:
-        pass
-
diff --git a/wally/main.py b/wally/main.py
index 11d6fc1..bfb9af7 100644
--- a/wally/main.py
+++ b/wally/main.py
@@ -5,7 +5,7 @@
 import logging
 import argparse
 import functools
-from typing import List, Tuple, Any, Callable, IO, cast, TYPE_CHECKING
+from typing import List, Tuple, Any, Callable, IO, cast, Optional
 from yaml import load as _yaml_load
 
 
@@ -29,7 +29,7 @@
 
 
 from . import utils, run_test, pretty_yaml
-from .storage import make_storage, IStorage
+from .storage import make_storage, Storage
 from .config import Config
 from .logger import setup_loggers
 from .stage import log_stage, StageType
@@ -72,6 +72,8 @@
     descr = "Disk io performance test suite"
     parser = argparse.ArgumentParser(prog='wally', description=descr)
     parser.add_argument("-l", '--log-level', help="print some extra log info")
+    parser.add_argument("-s", '--settings-dir', default=None,
+                        help="Folder to store key/settings/history files")
 
     subparsers = parser.add_subparsers(dest='subparser_name')
 
@@ -112,6 +114,17 @@
     return parser.parse_args(argv[1:])
 
 
+def get_config_path(config: Config, opts_value: Optional[str]) -> str:
+    if opts_value is None and 'settings_dir' not in config:
+        val = "~/.wally"
+    elif opts_value is not None:
+        val = opts_value
+    else:
+        val = config.settings_dir
+
+    return os.path.abspath(os.path.expanduser(val))
+
+
 def main(argv: List[str]) -> int:
     if faulthandler is not None:
         faulthandler.register(signal.SIGUSR1, all_threads=True)
@@ -123,7 +136,7 @@
 
     # stop mypy from telling that config & storage might be undeclared
     config = None  # type: Config
-    storage = None  # type: IStorage
+    storage = None  # type: Storage
 
     if opts.subparser_name == 'test':
         if opts.resume:
@@ -143,6 +156,7 @@
             config.build_id = opts.build_id
             config.build_description = opts.build_description
             config.build_type = opts.build_type
+            config.settings_dir = get_config_path(config, opts.settings_dir)
 
             storage = make_storage(config.storage_url)
 
@@ -174,7 +188,7 @@
 
     elif opts.subparser_name == 'report':
         storage = make_storage(opts.data_dir, existing=True)
-        config = storage.load('config', Config)
+        config.settings_dir = get_config_path(config, opts.settings_dir)
 
     elif opts.subparser_name == 'compare':
         x = run_test.load_data_from_path(opts.data_path1)
diff --git a/wally/node.py b/wally/node.py
index 8435cf3..3bc52fc 100644
--- a/wally/node.py
+++ b/wally/node.py
@@ -1,116 +1,214 @@
-import re
-import getpass
-from typing import Tuple
-from .inode import INode, NodeInfo
+import os
+import time
+import json
+import socket
+import logging
+import subprocess
+from typing import Callable
 
-from .ssh_utils import parse_ssh_uri, run_over_ssh, connect
+import agent
+
+from .node_interfaces import IRPCNode, NodeInfo, ISSHHost, RPCBeforeConnCallback
+from .ssh_utils import parse_ssh_uri, ssh_connect
 
 
-class Node(INode):
-    """Node object"""
+logger = logging.getLogger("wally")
 
-    def __init__(self, node_info: NodeInfo) -> None:
-        INode.__init__(self)
 
-        self.info = node_info
-        self.roles = node_info.roles
-        self.bind_ip = node_info.bind_ip
+class SSHHost(ISSHHost):
+    def __init__(self, ssh_conn, node_name: str, ip: str) -> None:
+        self.conn = ssh_conn
+        self.node_name = node_name
+        self.ip = ip
 
-        assert self.ssh_conn_url.startswith("ssh://")
-        self.ssh_conn_url = node_info.ssh_conn_url
-
-        self.ssh_conn = None
-        self.rpc_conn_url = None
-        self.rpc_conn = None
-        self.os_vm_id = None
-        self.hw_info = None
-
-        if self.ssh_conn_url is not None:
-            self.ssh_cred = parse_ssh_uri(self.ssh_conn_url)
-            self.node_id = "{0.host}:{0.port}".format(self.ssh_cred)
-        else:
-            self.ssh_cred = None
-            self.node_id = None
+    def get_ip(self) -> str:
+        return self.ip
 
     def __str__(self) -> str:
-        template = "<Node: url={conn_url!r} roles={roles}" + \
-                   " connected={is_connected}>"
-        return template.format(conn_url=self.ssh_conn_url,
-                               roles=", ".join(self.roles),
-                               is_connected=self.ssh_conn is not None)
+        return self.node_name
+
+    def put_to_file(self, path: str, content: bytes) -> None:
+        with self.conn.open_sftp() as sftp:
+            with sftp.open(path, "wb") as fd:
+                fd.write(content)
+
+    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
+        transport = self.conn.get_transport()
+        session = transport.open_session()
+
+        try:
+            session.set_combine_stderr(True)
+
+            stime = time.time()
+
+            if not nolog:
+                logger.debug("SSH:{0} Exec {1!r}".format(self, cmd))
+
+            session.exec_command(cmd)
+            session.settimeout(1)
+            session.shutdown_write()
+            output = ""
+
+            while True:
+                try:
+                    ndata = session.recv(1024)
+                    output += ndata
+                    if "" == ndata:
+                        break
+                except socket.timeout:
+                    pass
+
+                if time.time() - stime > timeout:
+                    raise OSError(output + "\nExecution timeout")
+
+            code = session.recv_exit_status()
+        finally:
+            found = False
+
+            if found:
+                session.close()
+
+        if code != 0:
+            templ = "SSH:{0} Cmd {1!r} failed with code {2}. Output: {3}"
+            raise OSError(templ.format(self, cmd, code, output))
+
+        return output
+
+
+class LocalHost(ISSHHost):
+    def __str__(self):
+        return "<Local>"
+
+    def get_ip(self) -> str:
+        return 'localhost'
+
+    def put_to_file(self, path: str, content: bytes) -> None:
+        dir_name = os.path.dirname(path)
+        os.makedirs(dir_name, exist_ok=True)
+
+        with open(path, "wb") as fd:
+            fd.write(content)
+
+    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
+        proc = subprocess.Popen(cmd, shell=True,
+                                stdin=subprocess.PIPE,
+                                stdout=subprocess.PIPE,
+                                stderr=subprocess.STDOUT)
+
+        stdout_data, _ = proc.communicate()
+        if proc.returncode != 0:
+            templ = "SSH:{0} Cmd {1!r} failed with code {2}. Output: {3}"
+            raise OSError(templ.format(self, cmd, proc.returncode, stdout_data))
+
+        return stdout_data
+
+
+def connect(conn_url: str, conn_timeout: int = 60) -> ISSHHost:
+    if conn_url == 'local':
+        return LocalHost()
+    else:
+        return SSHHost(*ssh_connect(parse_ssh_uri(conn_url), conn_timeout))
+
+
+class RPCNode(IRPCNode):
+    """Node object"""
+
+    def __init__(self, conn: agent.Client, info: NodeInfo) -> None:
+        self.info = info
+        self.conn = conn
+
+        # if self.ssh_conn_url is not None:
+        #     self.ssh_cred = parse_ssh_uri(self.ssh_conn_url)
+        #     self.node_id = "{0.host}:{0.port}".format(self.ssh_cred)
+        # else:
+        #     self.ssh_cred = None
+        #     self.node_id = None
+
+    def __str__(self) -> str:
+        return "<Node: url={!r} roles={!r} hops=/>".format(self.info.ssh_conn_url, ",".join(self.info.roles))
 
     def __repr__(self) -> str:
         return str(self)
 
-    def connect_ssh(self, timeout: int=None) -> None:
-        self.ssh_conn = connect(self.ssh_conn_url)
-
-    def connect_rpc(self) -> None:
-        raise NotImplementedError()
-
-    def prepare_rpc(self) -> None:
-        raise NotImplementedError()
-
-    def get_ip(self) -> str:
-        """get node connection ip address"""
-
-        if self.ssh_conn_url == 'local':
-            return '127.0.0.1'
-        return self.ssh_cred.host
-
-    def get_user(self) -> str:
-        """"get ssh connection username"""
-        if self.ssh_conn_url == 'local':
-            return getpass.getuser()
-        return self.ssh_cred.user
-
-    def run(self, cmd: str, stdin_data: str=None, timeout: int=60, nolog: bool=False) -> Tuple[int, str]:
-        """Run command on node. Will use rpc connection, if available"""
-
-        if self.rpc_conn is None:
-            return run_over_ssh(self.ssh_conn, cmd,
-                                stdin_data=stdin_data, timeout=timeout,
-                                nolog=nolog, node=self)
-        assert not stdin_data
-        proc_id = self.rpc_conn.cli.spawn(cmd)
-        exit_code = None
-        output = ""
-
-        while exit_code is None:
-            exit_code, stdout_data, stderr_data = self.rpc_conn.cli.get_updates(proc_id)
-            output += stdout_data + stderr_data
-
-        return exit_code, output
-
-    def discover_hardware_info(self) -> None:
-        raise NotImplementedError()
-
     def get_file_content(self, path: str) -> str:
         raise NotImplementedError()
 
     def forward_port(self, ip: str, remote_port: int, local_port: int = None) -> int:
         raise NotImplementedError()
 
-    def get_interface(self, ip: str) -> str:
-        """Get node external interface for given IP"""
-        data = self.run("ip a", nolog=True)
-        curr_iface = None
 
-        for line in data.split("\n"):
-            match1 = re.match(r"\d+:\s+(?P<name>.*?):\s\<", line)
-            if match1 is not None:
-                curr_iface = match1.group('name')
+def setup_rpc(node: ISSHHost, rpc_server_code: bytes, port: int = 0,
+              rpc_conn_callback: RPCBeforeConnCallback = None) -> IRPCNode:
+    code_file = node.run("mktemp").strip()
+    log_file = node.run("mktemp").strip()
+    node.put_to_file(code_file, rpc_server_code)
+    cmd = "python {code_file} server --listen-addr={listen_ip}:{port} --daemon " + \
+          "--show-settings --stdout-file={out_file}"
+    params_js = node.run(cmd.format(code_file=code_file,
+                                    listen_addr=node.get_ip(),
+                                    out_file=log_file,
+                                    port=port)).strip()
+    params = json.loads(params_js)
+    params['log_file'] = log_file
 
-            match2 = re.match(r"\s+inet\s+(?P<ip>[0-9.]+)/", line)
-            if match2 is not None:
-                if match2.group('ip') == ip:
-                    assert curr_iface is not None
-                    return curr_iface
+    if rpc_conn_callback:
+        ip, port = rpc_conn_callback(node, port)
+    else:
+        ip = node.get_ip()
+        port = int(params['addr'].split(":")[1])
 
-        raise KeyError("Can't found interface for ip {0}".format(ip))
+    rpc_conn = agent.connect((ip, port))
+    node.info.params.update(params)
+    return RPCNode(rpc_conn, node.info)
 
-    def sync_hw_info(self) -> None:
-        pass
 
-    def sync_sw_info(self) -> None:
-        pass
\ No newline at end of file
+
+        # class RemoteNode(node_interfaces.IRPCNode):
+#     def __init__(self, node_info: node_interfaces.NodeInfo, rpc_conn: agent.RPCClient):
+#         self.info = node_info
+#         self.rpc = rpc_conn
+#
+    # def get_interface(self, ip: str) -> str:
+    #     """Get node external interface for given IP"""
+    #     data = self.run("ip a", nolog=True)
+    #     curr_iface = None
+    #
+    #     for line in data.split("\n"):
+    #         match1 = re.match(r"\d+:\s+(?P<name>.*?):\s\<", line)
+    #         if match1 is not None:
+    #             curr_iface = match1.group('name')
+    #
+    #         match2 = re.match(r"\s+inet\s+(?P<ip>[0-9.]+)/", line)
+    #         if match2 is not None:
+    #             if match2.group('ip') == ip:
+    #                 assert curr_iface is not None
+    #                 return curr_iface
+    #
+    #     raise KeyError("Can't found interface for ip {0}".format(ip))
+    #
+    # def get_user(self) -> str:
+    #     """"get ssh connection username"""
+    #     if self.ssh_conn_url == 'local':
+    #         return getpass.getuser()
+    #     return self.ssh_cred.user
+    #
+    #
+    # def run(self, cmd: str, stdin_data: str = None, timeout: int = 60, nolog: bool = False) -> Tuple[int, str]:
+    #     """Run command on node. Will use rpc connection, if available"""
+    #
+    #     if self.rpc_conn is None:
+    #         return run_over_ssh(self.ssh_conn, cmd,
+    #                             stdin_data=stdin_data, timeout=timeout,
+    #                             nolog=nolog, node=self)
+    #     assert not stdin_data
+    #     proc_id = self.rpc_conn.cli.spawn(cmd)
+    #     exit_code = None
+    #     output = ""
+    #
+    #     while exit_code is None:
+    #         exit_code, stdout_data, stderr_data = self.rpc_conn.cli.get_updates(proc_id)
+    #         output += stdout_data + stderr_data
+    #
+    #     return exit_code, output
+
+
diff --git a/wally/node_interfaces.py b/wally/node_interfaces.py
new file mode 100644
index 0000000..e0b56aa
--- /dev/null
+++ b/wally/node_interfaces.py
@@ -0,0 +1,90 @@
+import abc
+from typing import Any, Set, Optional, List, Dict, Callable
+
+
+class NodeInfo:
+    """Node information object, result of dicovery process or config parsing"""
+
+    def __init__(self,
+                 ssh_conn_url: str,
+                 roles: Set[str],
+                 hops: List['NodeInfo'] = None,
+                 ssh_key: bytes = None) -> None:
+
+        self.hops = []  # type: List[NodeInfo]
+        if hops is not None:
+            self.hops = hops
+
+        self.ssh_conn_url = ssh_conn_url  # type: str
+        self.rpc_conn_url = None  # type: str
+        self.roles = roles  # type: Set[str]
+        self.os_vm_id = None  # type: Optional[int]
+        self.ssh_key = ssh_key  # type: Optional[bytes]
+        self.params = {}  # type: Dict[str, Any]
+
+
+class ISSHHost(metaclass=abc.ABCMeta):
+    """Minimal interface, required to setup RPC connection"""
+    info = None  # type: NodeInfo
+
+    @abc.abstractmethod
+    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
+        pass
+
+    @abc.abstractmethod
+    def get_ip(self) -> str:
+        pass
+
+    @abc.abstractmethod
+    def __str__(self) -> str:
+        pass
+
+    @abc.abstractmethod
+    def put_to_file(self, path: str, content: bytes) -> None:
+        pass
+
+
+class IRPCNode(metaclass=abc.ABCMeta):
+    """Remote filesystem interface"""
+    info = None  # type: NodeInfo
+
+    @abc.abstractmethod
+    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
+        pass
+
+    @abc.abstractmethod
+    def copy_file(self, local_path: str, remote_path: str = None) -> str:
+        pass
+
+    @abc.abstractmethod
+    def get_file_content(self, path: str) -> bytes:
+        pass
+
+    @abc.abstractmethod
+    def put_to_file(self, path:str, content: bytes) -> None:
+        pass
+
+    @abc.abstractmethod
+    def forward_port(self, ip: str, remote_port: int, local_port: int = None) -> int:
+        pass
+
+    @abc.abstractmethod
+    def get_interface(self, ip: str) -> str:
+        pass
+
+    @abc.abstractmethod
+    def stat_file(self, path:str) -> Any:
+        pass
+
+    @abc.abstractmethod
+    def node_id(self) -> str:
+        pass
+
+
+    @abc.abstractmethod
+    def disconnect(self) -> str:
+        pass
+
+
+
+RPCBeforeConnCallback = Callable[[NodeInfo, int], None]
\ No newline at end of file
diff --git a/wally/run_test.py b/wally/run_test.py
index b96ecf8..e62cfb1 100755
--- a/wally/run_test.py
+++ b/wally/run_test.py
@@ -4,13 +4,14 @@
 import functools
 import contextlib
 import collections
-from typing import List, Dict, Iterable, Any, Iterator, Mapping, Callable, Tuple, Optional
+from typing import List, Dict, Iterable, Any, Iterator, Mapping, Callable, Tuple, Optional, Union, cast
 from concurrent.futures import ThreadPoolExecutor, Future
 
-from .inode import INode
-from .discover import discover
+from .node_interfaces import NodeInfo, IRPCNode
 from .test_run_class import TestRun
+from .discover import discover
 from . import pretty_yaml, utils, report, ssh_utils, start_vms, hw_info
+from .config import ConfigBlock, Config
 
 from .suits.mysql import MysqlTest
 from .suits.itest import TestConfig
@@ -30,37 +31,35 @@
 logger = logging.getLogger("wally")
 
 
-
-def connect_all(nodes: Iterable[INode],
+def connect_all(nodes_info: List[NodeInfo],
                 pool: ThreadPoolExecutor,
                 conn_timeout: int = 30,
-                rpc_conn_callback: ssh_utils.RPCBeforeConnCallback = None) -> None:
-    """Connect to all nodes, log errors
-    nodes - list of nodes
-    """
+                rpc_conn_callback: ssh_utils.RPCBeforeConnCallback = None) -> List[IRPCNode]:
+    """Connect to all nodes, log errors"""
 
-    logger.info("Connecting to %s nodes", len(nodes))
+    logger.info("Connecting to %s nodes", len(nodes_info))
 
-    def connect_ext(node: INode) -> bool:
+    def connect_ext(node_info: NodeInfo) -> Tuple[bool, Union[IRPCNode, NodeInfo]]:
         try:
-            node.connect_ssh(conn_timeout)
-            node.rpc, node.rpc_params = ssh_utils.setup_rpc(node, rpc_conn_callback=rpc_conn_callback)
-            return True
+            ssh_node = ssh_utils.connect(node_info.ssh_conn_url, conn_timeout=conn_timeout)
+            return True, ssh_utils.setup_rpc(ssh_node, rpc_conn_callback=rpc_conn_callback)
         except Exception as exc:
             logger.error("During connect to {}: {!s}".format(node, exc))
-            return False
+            return False, node_info
 
-    list(pool.map(connect_ext, nodes))
+    failed_testnodes = []  # type: List[NodeInfo]
+    failed_nodes = []  # type: List[NodeInfo]
+    ready = []  # type: List[IRPCNode]
 
-    failed_testnodes = []
-    failed_nodes = []
-
-    for node in nodes:
-        if not node.is_connected():
+    for ok, node in pool.map(connect_ext, nodes_info):
+        if not ok:
+            node = cast(NodeInfo, node)
             if 'testnode' in node.roles:
                 failed_testnodes.append(node)
             else:
                 failed_nodes.append(node)
+        else:
+            ready.append(cast(IRPCNode, node))
 
     if failed_nodes:
         msg = "Node(s) {} would be excluded - can't connect"
@@ -75,15 +74,17 @@
     if not failed_nodes:
         logger.info("All nodes connected successfully")
 
+    return ready
 
-def collect_info_stage(ctx: TestRun, nodes: Iterable[INode]) -> None:
-    futures = {}  # type: Dict[str, Future]
+
+def collect_info_stage(ctx: TestRun, nodes: Iterable[IRPCNode]) -> None:
+    futures = {}  # type: Dict[str, Future]]
 
     with ctx.get_pool() as pool:
         for node in nodes:
             hw_info_path = "hw_info/{}".format(node.node_id())
             if hw_info_path not in ctx.storage:
-                futures[hw_info_path] = pool.submit(hw_info.get_hw_info, node)
+                futures[hw_info_path] = pool.submit(hw_info.get_hw_info, node), node
 
             sw_info_path = "sw_info/{}".format(node.node_id())
             if sw_info_path not in ctx.storage:
@@ -94,174 +95,118 @@
 
 
 @contextlib.contextmanager
-def suspend_vm_nodes_ctx(unused_nodes: List[INode]) -> Iterator[List[int]]:
+def suspend_vm_nodes_ctx(unused_nodes: List[IRPCNode]) -> Iterator[List[int]]:
 
-    pausable_nodes_ids = [node.os_vm_id for node in unused_nodes
-                          if node.os_vm_id is not None]
+    pausable_nodes_ids = [cast(int, node.info.os_vm_id)
+                          for node in unused_nodes
+                          if node.info.os_vm_id is not None]
 
     non_pausable = len(unused_nodes) - len(pausable_nodes_ids)
 
-    if 0 != non_pausable:
-        logger.warning("Can't pause {} nodes".format(
-                       non_pausable))
+    if non_pausable:
+        logger.warning("Can't pause {} nodes".format(non_pausable))
 
-    if len(pausable_nodes_ids) != 0:
-        logger.debug("Try to pause {} unused nodes".format(
-                     len(pausable_nodes_ids)))
+    if pausable_nodes_ids:
+        logger.debug("Try to pause {} unused nodes".format(len(pausable_nodes_ids)))
         start_vms.pause(pausable_nodes_ids)
 
     try:
         yield pausable_nodes_ids
     finally:
-        if len(pausable_nodes_ids) != 0:
-            logger.debug("Unpausing {} nodes".format(
-                         len(pausable_nodes_ids)))
+        if pausable_nodes_ids:
+            logger.debug("Unpausing {} nodes".format(len(pausable_nodes_ids)))
             start_vms.unpause(pausable_nodes_ids)
 
 
-def generate_result_dir_name(results: str, name: str, params: Dict[str, Any]) -> str:
-    # make a directory for results
-    all_tests_dirs = os.listdir(results)
-
-    if 'name' in params:
-        dir_name = "{}_{}".format(name, params['name'])
-    else:
-        for idx in range(len(all_tests_dirs) + 1):
-            dir_name = "{}_{}".format(name, idx)
-            if dir_name not in all_tests_dirs:
-                break
-        else:
-            raise utils.StopTestError("Can't select directory for test results")
-
-    return os.path.join(results, dir_name)
-
-
-@contextlib.contextmanager
-def sensor_monitoring(sensor_cfg: Any, nodes: Iterable[INode]) -> Iterator[None]:
-    # TODO(koder): write this function
-    pass
-
-
-def run_tests(cfg: Config,
-              test_block: Dict[str, Dict[str, Any]],
-              nodes: Iterable[INode]) -> Iterator[Tuple[str, List[Any]]]:
+def run_tests(ctx: TestRun, test_block: ConfigBlock, nodes: List[IRPCNode]) -> None:
     """Run test from test block"""
 
-    test_nodes = [node for node in nodes if 'testnode' in node.roles]
+    test_nodes = [node for node in nodes if 'testnode' in node.info.roles]
 
-    if len(test_nodes) == 0:
+    if not test_nodes:
         logger.error("No test nodes found")
         return
 
     for name, params in test_block.items():
-        results = []
+        vm_count = params.get('node_limit', None)  # type: Optional[int]
 
-        # iterate over all node counts
-        limit = params.get('node_limit', len(test_nodes))
-        if isinstance(limit, int):
-            vm_limits = [limit]  # type: List[int]
+        # select test nodes
+        if vm_count is None:
+            curr_test_nodes = test_nodes
+            unused_nodes = []
         else:
-            list_or_tpl = isinstance(limit, (tuple, list))
-            all_ints = list_or_tpl and all(isinstance(climit, int)
-                                           for climit in limit)
-            if not all_ints:
-                msg = "'node_limit' parameter ion config should" + \
-                      "be either int or list if integers, not {0!r}".format(limit)
-                raise ValueError(msg)
-            vm_limits = limit  # type: List[int]
+            curr_test_nodes = test_nodes[:vm_count]
+            unused_nodes = test_nodes[vm_count:]
 
-        for vm_count in vm_limits:
-            # select test nodes
-            if vm_count == 'all':
-                curr_test_nodes = test_nodes
-                unused_nodes = []
-            else:
-                curr_test_nodes = test_nodes[:vm_count]
-                unused_nodes = test_nodes[vm_count:]
+        if not curr_test_nodes:
+            logger.error("No nodes found for test, skipping it.")
+            continue
 
-            if 0 == len(curr_test_nodes):
-                continue
+        # results_path = generate_result_dir_name(cfg.results_storage, name, params)
+        # utils.mkdirs_if_unxists(results_path)
 
-            results_path = generate_result_dir_name(cfg.results_storage, name, params)
-            utils.mkdirs_if_unxists(results_path)
+        # suspend all unused virtual nodes
+        if ctx.config.get('suspend_unused_vms', True):
+            suspend_ctx = suspend_vm_nodes_ctx(unused_nodes)
+        else:
+            suspend_ctx = utils.empty_ctx()
 
-            # suspend all unused virtual nodes
-            if cfg.settings.get('suspend_unused_vms', True):
-                suspend_ctx = suspend_vm_nodes_ctx(unused_nodes)
-            else:
-                suspend_ctx = utils.empty_ctx()
+        with suspend_ctx:
+            resumable_nodes_ids = [cast(int, node.info.os_vm_id)
+                                   for node in curr_test_nodes
+                                   if node.info.os_vm_id is not None]
 
-            with suspend_ctx:
-                resumable_nodes_ids = [node.os_vm_id for node in curr_test_nodes
-                                       if node.os_vm_id is not None]
+            if resumable_nodes_ids:
+                logger.debug("Check and unpause {} nodes".format(len(resumable_nodes_ids)))
+                start_vms.unpause(resumable_nodes_ids)
 
-                if len(resumable_nodes_ids) != 0:
-                    logger.debug("Check and unpause {} nodes".format(
-                                 len(resumable_nodes_ids)))
-                    start_vms.unpause(resumable_nodes_ids)
+            test_cls = TOOL_TYPE_MAPPER[name]
 
-                test_cls = TOOL_TYPE_MAPPER[name]
+            remote_dir = ctx.config.default_test_local_folder.format(name=name, uuid=ctx.config.run_uuid)
 
-                remote_dir = cfg.default_test_local_folder.format(name=name)
+            test_cfg = TestConfig(test_cls.__name__,
+                                  params=params,
+                                  run_uuid=ctx.config.run_uuid,
+                                  nodes=test_nodes,
+                                  storage=ctx.storage,
+                                  remote_dir=remote_dir)
 
-                test_cfg = TestConfig(test_cls.__name__,
-                                      params=params,
-                                      test_uuid=cfg.run_uuid,
-                                      nodes=test_nodes,
-                                      log_directory=results_path,
-                                      remote_dir=remote_dir)
-
-                t_start = time.time()
-                res = test_cls(test_cfg).run()
-                t_end = time.time()
-
-            results.append(res)
-
-        yield name, results
+            test_cls(test_cfg).run()
 
 
-def connect_stage(cfg: Config, ctx: TestRun) -> None:
+def connect_stage(ctx: TestRun) -> None:
     ctx.clear_calls_stack.append(disconnect_stage)
-    connect_all(ctx.nodes)
-    ctx.nodes = [node for node in ctx.nodes if node.is_connected()]
+
+    with ctx.get_pool() as pool:
+        ctx.nodes = connect_all(ctx.nodes_info, pool, rpc_conn_callback=ctx.before_conn_callback)
 
 
-def discover_stage(cfg: Config, ctx: TestRun) -> None:
+def discover_stage(ctx: TestRun) -> None:
     """discover clusters and nodes stage"""
 
-    if cfg.get('discover') is not None:
-        discover_objs = [i.strip() for i in cfg.discover.strip().split(",")]
+    discover_info = ctx.config.get('discover')
+    if discover_info:
+        discover_objs = [i.strip() for i in discover_info.strip().split(",")]
 
-        nodes = discover(ctx,
-                         discover_objs,
-                         cfg.clouds,
-                         cfg.results_storage,
-                         not cfg.dont_discover_nodes)
+        nodes_info = discover.discover(ctx, discover_objs,
+                                       ctx.config.clouds,
+                                       ctx.storage,
+                                       not ctx.config.dont_discover_nodes)
 
-        ctx.nodes.extend(nodes)
+        ctx.nodes_info.extend(nodes_info)
 
-    for url, roles in cfg.get('explicit_nodes', {}).items():
-        ctx.nodes.append(Node(url, roles.split(",")))
+    for url, roles in ctx.config.get('explicit_nodes', {}).items():
+        ctx.nodes_info.append(NodeInfo(url, set(roles.split(","))))
 
 
-def save_nodes_stage(cfg: Config, ctx: TestRun) -> None:
+def save_nodes_stage(ctx: TestRun) -> None:
     """Save nodes list to file"""
-    cluster = {}
-    for node in ctx.nodes:
-        roles = node.roles[:]
-        if 'testnode' in roles:
-            roles.remove('testnode')
-
-        if len(roles) != 0:
-            cluster[node.ssh_conn_url] = roles
-
-    with open(cfg.nodes_report_file, "w") as fd:
-        fd.write(pretty_yaml.dumps(cluster))
+    ctx.storage['nodes'] = ctx.nodes_info
 
 
-def reuse_vms_stage(cfg: Config, ctx: TestRun) -> None:
-    vms_patterns = cfg.get('clouds', {}).get('openstack', {}).get('vms', [])
-    private_key_path = get_vm_keypair(cfg)['keypair_file_private']
+def reuse_vms_stage(ctx: TestRun) -> None:
+    vms_patterns = ctx.config.get('clouds/openstack/vms', [])
+    private_key_path = get_vm_keypair(ctx.config)['keypair_file_private']
 
     for creds in vms_patterns:
         user_name, vm_name_pattern = creds.split("@", 1)
@@ -272,7 +217,7 @@
             logger.debug(msg)
 
             if not start_vms.is_connected():
-                os_creds = get_OS_credentials(cfg, ctx)
+                os_creds = get_OS_credentials(ctx)
             else:
                 os_creds = None
 
@@ -281,15 +226,16 @@
                 conn_url = "ssh://{user}@{ip}::{key}".format(user=user_name,
                                                              ip=ip,
                                                              key=private_key_path)
-                node = Node(conn_url, ['testnode'])
-                node.os_vm_id = vm_id
-                ctx.nodes.append(node)
+                node_info = NodeInfo(conn_url, ['testnode'])
+                node_info.os_vm_id = vm_id
+                ctx.nodes_info.append(node_info)
 
 
-def get_OS_credentials(cfg: Config, ctx: TestRun) -> None:
+def get_OS_credentials(ctx: TestRun) -> None:
     creds = None
     os_creds = None
     force_insecure = False
+    cfg = ctx.config
 
     if 'openstack' in cfg.clouds:
         os_cfg = cfg.clouds['openstack']
@@ -336,75 +282,65 @@
     return creds
 
 
-def get_vm_keypair(cfg: Config) -> Dict[str, str]:
-    res = {}  # type: Dict[str, str]
-    for field, ext in (('keypair_file_private', 'pem'),
-                       ('keypair_file_public', 'pub')):
-        fpath = cfg.vm_configs.get(field)
-
-        if fpath is None:
-            fpath = cfg.vm_configs['keypair_name'] + "." + ext
-
-        if os.path.isabs(fpath):
-            res[field] = fpath
-        else:
-            res[field] = os.path.join(cfg.config_folder, fpath)
-    return res
+def get_vm_keypair(cfg: Config) -> Tuple[str, str]:
+    key_name = cfg.vm_configs['keypair_name']
+    private_path = os.path.join(cfg.settings_dir, key_name + "_private.pem")
+    public_path = os.path.join(cfg.settings_dir, key_name + "_public.pub")
+    return (private_path, public_path)
 
 
 @contextlib.contextmanager
-def create_vms_ctx(ctx: TestRun, cfg: Config, config, already_has_count: int=0) -> Iterator[List[INode]]:
-    if config['count'].startswith('='):
-        count = int(config['count'][1:])
+def create_vms_ctx(ctx: TestRun, vm_config: ConfigBlock, already_has_count: int = 0) -> Iterator[List[NodeInfo]]:
+    if vm_config['count'].startswith('='):
+        count = int(vm_config['count'][1:])
         if count <= already_has_count:
             logger.debug("Not need new vms")
             yield []
             return
 
-    params = cfg.vm_configs[config['cfg_name']].copy()
-    os_nodes_ids = []
-
     if not start_vms.is_connected():
-        os_creds = get_OS_credentials(cfg, ctx)
+        os_creds = get_OS_credentials(ctx)
     else:
         os_creds = None
 
     nova = start_vms.nova_connect(os_creds)
 
-    params.update(config)
-    params.update(get_vm_keypair(cfg))
+    os_nodes_ids = ctx.storage.get('spawned_vm_ids', [])  # # type: List[int]
+    new_nodes = []  # type: List[IRPCNode]
 
-    params['group_name'] = cfg.run_uuid
-    params['keypair_name'] = cfg.vm_configs['keypair_name']
+    if not os_nodes_ids:
+        params = ctx.config.vm_configs[vm_config['cfg_name']].copy()
+        params.update(vm_config)
+        params.update(get_vm_keypair(ctx.config))
+        params['group_name'] = ctx.config.run_uuid
+        params['keypair_name'] = ctx.config.vm_configs['keypair_name']
 
-    if not config.get('skip_preparation', False):
-        logger.info("Preparing openstack")
-        start_vms.prepare_os(nova, params, os_creds)
+        if not vm_config.get('skip_preparation', False):
+            logger.info("Preparing openstack")
+            start_vms.prepare_os(nova, params, os_creds)
+    else:
+        # TODO(koder): reconnect to old VM's
+        raise NotImplementedError("Reconnect to old vms is not implemented")
 
-    new_nodes = []
+    already_has_count += len(os_nodes_ids)
     old_nodes = ctx.nodes[:]
-    try:
-        for new_node, node_id in start_vms.launch_vms(nova, params, already_has_count):
-            new_node.roles.append('testnode')
-            ctx.nodes.append(new_node)
-            os_nodes_ids.append(node_id)
-            new_nodes.append(new_node)
 
-        store_nodes_in_log(cfg, os_nodes_ids)
-        ctx.openstack_nodes_ids = os_nodes_ids
+    for node_info, node_id in start_vms.launch_vms(nova, params, already_has_count):
+        node_info.roles.append('testnode')
+        os_nodes_ids.append(node_id)
+        new_nodes.append(node_info)
+        ctx.storage['spawned_vm_ids'] = os_nodes_ids
 
-        yield new_nodes
+    yield new_nodes
 
-    finally:
-        if not cfg.keep_vm:
-            shut_down_vms_stage(cfg, ctx)
-        ctx.nodes = old_nodes
+    # keep nodes in case of error for future test restart
+    if not ctx.config.keep_vm:
+        shut_down_vms_stage(ctx, os_nodes_ids)
+        ctx.storage['spawned_vm_ids'] = []
 
 
-def run_tests_stage(cfg: Config, ctx: TestRun) -> None:
-    ctx.results = collections.defaultdict(lambda: [])
-
-    for group in cfg.get('tests', []):
+def run_tests_stage(ctx: TestRun) -> None:
+    for group in ctx.config.get('tests', []):
         gitems = list(group.items())
         if len(gitems) != 1:
             msg = "Items in tests section should have len == 1"
@@ -419,159 +355,138 @@
                 logger.error(msg)
                 raise utils.StopTestError(msg)
 
-            num_test_nodes = 0
-            for node in ctx.nodes:
-                if 'testnode' in node.roles:
-                    num_test_nodes += 1
-
-            vm_ctx = create_vms_ctx(ctx, cfg, config['openstack'],
-                                    num_test_nodes)
+            num_test_nodes = len([node for node in ctx.nodes if 'testnode' in node.info.roles])
+            vm_ctx = create_vms_ctx(ctx, config['openstack'], num_test_nodes)
             tests = config.get('tests', [])
         else:
             vm_ctx = utils.empty_ctx([])
             tests = [group]
 
-        if cfg.get('sensors') is None:
-            sensor_ctx = utils.empty_ctx()
-        else:
-            sensor_ctx = sensor_monitoring(cfg.get('sensors'), ctx.nodes)
+        with vm_ctx as new_nodes:  # type: List[NodeInfo]
+            if new_nodes:
+                with ctx.get_pool() as pool:
+                    new_rpc_nodes = connect_all(new_nodes, pool, rpc_conn_callback=ctx.before_conn_callback)
 
-        with vm_ctx as new_nodes:
-            if len(new_nodes) != 0:
-                connect_all(new_nodes, True)
+            test_nodes = ctx.nodes + new_rpc_nodes
 
-            if not cfg.no_tests:
+            if ctx.config.get('sensors'):
+                sensor_ctx = sensor_monitoring(ctx.config.get('sensors'), test_nodes)
+            else:
+                sensor_ctx = utils.empty_ctx([])
+
+            if not ctx.config.no_tests:
                 for test_group in tests:
                     with sensor_ctx:
-                        it = run_tests(cfg, test_group, ctx.nodes)
-                        for tp, res in it:
-                            ctx.results[tp].extend(res)
+                        run_tests(ctx, test_group, test_nodes)
+
+            for node in new_rpc_nodes:
+                node.disconnect()
 
 
-def shut_down_vms_stage(cfg: Config, ctx: TestRun) -> None:
-    vm_ids_fname = cfg.vm_ids_fname
-    if ctx.openstack_nodes_ids is None:
-        nodes_ids = open(vm_ids_fname).read().split()
-    else:
-        nodes_ids = ctx.openstack_nodes_ids
-
-    if len(nodes_ids) != 0:
+def shut_down_vms_stage(ctx: TestRun, nodes_ids: List[int]) -> None:
+    if nodes_ids:
         logger.info("Removing nodes")
         start_vms.clear_nodes(nodes_ids)
         logger.info("Nodes has been removed")
 
-    if os.path.exists(vm_ids_fname):
-        os.remove(vm_ids_fname)
+
+def clear_enviroment(ctx: TestRun) -> None:
+    shut_down_vms_stage(ctx, ctx.storage.get('spawned_vm_ids', []))
+    ctx.storage['spawned_vm_ids'] = []
 
 
-def store_nodes_in_log(cfg: Config, nodes_ids: Iterable[str]) -> None:
-    with open(cfg.vm_ids_fname, 'w') as fd:
-        fd.write("\n".join(nodes_ids))
-
-
-def clear_enviroment(cfg: Config, ctx: TestRun) -> None:
-    if os.path.exists(cfg.vm_ids_fname):
-        shut_down_vms_stage(cfg, ctx)
-
-
-def disconnect_stage(cfg: Config, ctx: TestRun) -> None:
-    ssh_utils.close_all_sessions()
+def disconnect_stage(ctx: TestRun) -> None:
+    # TODO(koder): what next line was for?
+    # ssh_utils.close_all_sessions()
 
     for node in ctx.nodes:
         node.disconnect()
 
 
-def store_raw_results_stage(cfg: Config, ctx: TestRun) -> None:
-    if os.path.exists(cfg.raw_results):
-        cont = yaml_load(open(cfg.raw_results).read())
-    else:
-        cont = []
-
-    cont.extend(utils.yamable(ctx.results).items())
-    raw_data = pretty_yaml.dumps(cont)
-
-    with open(cfg.raw_results, "w") as fd:
-        fd.write(raw_data)
+def console_report_stage(ctx: TestRun) -> None:
+    # TODO(koder): load data from storage
+    raise NotImplementedError("...")
+    # first_report = True
+    # text_rep_fname = ctx.config.text_report_file
+    #
+    # with open(text_rep_fname, "w") as fd:
+    #     for tp, data in ctx.results.items():
+    #         if 'io' == tp and data is not None:
+    #             rep_lst = []
+    #             for result in data:
+    #                 rep_lst.append(
+    #                     IOPerfTest.format_for_console(list(result)))
+    #             rep = "\n\n".join(rep_lst)
+    #         elif tp in ['mysql', 'pgbench'] and data is not None:
+    #             rep = MysqlTest.format_for_console(data)
+    #         elif tp == 'omg':
+    #             rep = OmgTest.format_for_console(data)
+    #         else:
+    #             logger.warning("Can't generate text report for " + tp)
+    #             continue
+    #
+    #         fd.write(rep)
+    #         fd.write("\n")
+    #
+    #         if first_report:
+    #             logger.info("Text report were stored in " + text_rep_fname)
+    #             first_report = False
+    #
+    #         print("\n" + rep + "\n")
 
 
-def console_report_stage(cfg: Config, ctx: TestRun) -> None:
-    first_report = True
-    text_rep_fname = cfg.text_report_file
-    with open(text_rep_fname, "w") as fd:
-        for tp, data in ctx.results.items():
-            if 'io' == tp and data is not None:
-                rep_lst = []
-                for result in data:
-                    rep_lst.append(
-                        IOPerfTest.format_for_console(list(result)))
-                rep = "\n\n".join(rep_lst)
-            elif tp in ['mysql', 'pgbench'] and data is not None:
-                rep = MysqlTest.format_for_console(data)
-            elif tp == 'omg':
-                rep = OmgTest.format_for_console(data)
-            else:
-                logger.warning("Can't generate text report for " + tp)
-                continue
+# def test_load_report_stage(cfg: Config, ctx: TestRun) -> None:
+#     load_rep_fname = cfg.load_report_file
+#     found = False
+#     for idx, (tp, data) in enumerate(ctx.results.items()):
+#         if 'io' == tp and data is not None:
+#             if found:
+#                 logger.error("Making reports for more than one " +
+#                              "io block isn't supported! All " +
+#                              "report, except first are skipped")
+#                 continue
+#             found = True
+#             report.make_load_report(idx, cfg['results'], load_rep_fname)
+#
+#
 
-            fd.write(rep)
-            fd.write("\n")
+def html_report_stage(ctx: TestRun) -> None:
+    # TODO(koder): load data from storage
+    raise NotImplementedError("...")
+    # html_rep_fname = cfg.html_report_file
+    # found = False
+    # for tp, data in ctx.results.items():
+    #     if 'io' == tp and data is not None:
+    #         if found or len(data) > 1:
+    #             logger.error("Making reports for more than one " +
+    #                          "io block isn't supported! All " +
+    #                          "report, except first are skipped")
+    #             continue
+    #         found = True
+    #         report.make_io_report(list(data[0]),
+    #                               cfg.get('comment', ''),
+    #                               html_rep_fname,
+    #                               lab_info=ctx.nodes)
 
-            if first_report:
-                logger.info("Text report were stored in " + text_rep_fname)
-                first_report = False
-
-            print("\n" + rep + "\n")
-
-
-def test_load_report_stage(cfg: Config, ctx: TestRun) -> None:
-    load_rep_fname = cfg.load_report_file
-    found = False
-    for idx, (tp, data) in enumerate(ctx.results.items()):
-        if 'io' == tp and data is not None:
-            if found:
-                logger.error("Making reports for more than one " +
-                             "io block isn't supported! All " +
-                             "report, except first are skipped")
-                continue
-            found = True
-            report.make_load_report(idx, cfg['results'], load_rep_fname)
-
-
-def html_report_stage(cfg: Config, ctx: TestRun) -> None:
-    html_rep_fname = cfg.html_report_file
-    found = False
-    for tp, data in ctx.results.items():
-        if 'io' == tp and data is not None:
-            if found or len(data) > 1:
-                logger.error("Making reports for more than one " +
-                             "io block isn't supported! All " +
-                             "report, except first are skipped")
-                continue
-            found = True
-            report.make_io_report(list(data[0]),
-                                  cfg.get('comment', ''),
-                                  html_rep_fname,
-                                  lab_info=ctx.nodes)
-
-
-def load_data_from_path(test_res_dir: str) -> Mapping[str, List[Any]]:
-    files = get_test_files(test_res_dir)
-    raw_res = yaml_load(open(files['raw_results']).read())
-    res = collections.defaultdict(list)
-
-    for tp, test_lists in raw_res:
-        for tests in test_lists:
-            for suite_name, suite_data in tests.items():
-                result_folder = suite_data[0]
-                res[tp].append(TOOL_TYPE_MAPPER[tp].load(suite_name, result_folder))
-
-    return res
-
-
-def load_data_from_path_stage(var_dir: str, _, ctx: TestRun) -> None:
-    for tp, vals in load_data_from_path(var_dir).items():
-        ctx.results.setdefault(tp, []).extend(vals)
-
-
-def load_data_from(var_dir: str) -> Callable[[TestRun], None]:
-    return functools.partial(load_data_from_path_stage, var_dir)
+#
+# def load_data_from_path(test_res_dir: str) -> Mapping[str, List[Any]]:
+#     files = get_test_files(test_res_dir)
+#     raw_res = yaml_load(open(files['raw_results']).read())
+#     res = collections.defaultdict(list)
+#
+#     for tp, test_lists in raw_res:
+#         for tests in test_lists:
+#             for suite_name, suite_data in tests.items():
+#                 result_folder = suite_data[0]
+#                 res[tp].append(TOOL_TYPE_MAPPER[tp].load(suite_name, result_folder))
+#
+#     return res
+#
+#
+# def load_data_from_path_stage(var_dir: str, _, ctx: TestRun) -> None:
+#     for tp, vals in load_data_from_path(var_dir).items():
+#         ctx.results.setdefault(tp, []).extend(vals)
+#
+#
+# def load_data_from(var_dir: str) -> Callable[[TestRun], None]:
+#     return functools.partial(load_data_from_path_stage, var_dir)
diff --git a/wally/ssh_utils.py b/wally/ssh_utils.py
index 2941e7c..7728dfd 100644
--- a/wally/ssh_utils.py
+++ b/wally/ssh_utils.py
@@ -1,27 +1,25 @@
 import re
-import json
 import time
+import errno
 import socket
 import logging
 import os.path
 import getpass
+import selectors
 from io import BytesIO
-import subprocess
-from typing import Union, Optional, cast, Dict, List, Tuple, Any, Callable
-from concurrent.futures import ThreadPoolExecutor
+from typing import Union, Optional, cast, Dict, List, Tuple
 
 import paramiko
 
-import agent
-
-from . import interfaces, utils
+from . import utils
 
 
 logger = logging.getLogger("wally")
+IPAddr = Tuple[str, int]
 
 
-class URIsNamespace(object):
-    class ReParts(object):
+class URIsNamespace:
+    class ReParts:
         user_rr = "[^:]*?"
         host_rr = "[^:@]*?"
         port_rr = "\\d+"
@@ -58,41 +56,27 @@
 class ConnCreds:
     conn_uri_attrs = ("user", "passwd", "host", "port", "key_file")
 
-    def __init__(self) -> None:
-        self.user = None  # type: Optional[str]
-        self.passwd = None  # type: Optional[str]
-        self.host = None  # type: str
-        self.port = 22  # type: int
-        self.key_file = None  # type: Optional[str]
+    def __init__(self, host: str, user: str, passwd: str = None, port: int = 22, key_file: str = None) -> None:
+        self.user = user
+        self.passwd = passwd
+        self.host = host
+        self.port = port
+        self.key_file = key_file
 
     def __str__(self) -> str:
         return str(self.__dict__)
 
 
-SSHCredsType = Union[str, ConnCreds]
-
-
 def parse_ssh_uri(uri: str) -> ConnCreds:
-    # [ssh://]+
-    # user:passwd@ip_host:port
-    # user:passwd@ip_host
-    # user@ip_host:port
-    # user@ip_host
-    # ip_host:port
-    # ip_host
-    # user@ip_host:port:path_to_key_file
-    # user@ip_host::path_to_key_file
-    # ip_host:port:path_to_key_file
-    # ip_host::path_to_key_file
+    """Parse ssh connection URL from one of following form
+        [ssh://]user:passwd@host[:port]
+        [ssh://][user@]host[:port][:key_file]
+    """
 
     if uri.startswith("ssh://"):
         uri = uri[len("ssh://"):]
 
-    res = ConnCreds()
-    res.port = 22
-    res.key_file = None
-    res.passwd = None
-    res.user = getpass.getuser()
+    res = ConnCreds("", getpass.getuser())
 
     for rr in URIsNamespace.uri_reg_exprs:
         rrm = re.match(rr, uri)
@@ -103,109 +87,18 @@
     raise ValueError("Can't parse {0!r} as ssh uri value".format(uri))
 
 
-class LocalHost(interfaces.IHost):
-    def __str__(self):
-        return "<Local>"
-
-    def get_ip(self) -> str:
-        return 'localhost'
-
-    def put_to_file(self, path: str, content: bytes) -> None:
-        dirname = os.path.dirname(path)
-        if not os.path.exists(dirname):
-            os.makedirs(dirname)
-        with open(path, "wb") as fd:
-            fd.write(content)
-
-    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
-        proc = subprocess.Popen(cmd, shell=True,
-                                stdin=subprocess.PIPE,
-                                stdout=subprocess.PIPE,
-                                stderr=subprocess.STDOUT)
-
-        stdout_data, _ = proc.communicate()
-        if proc.returncode != 0:
-            templ = "SSH:{0} Cmd {1!r} failed with code {2}. Output: {3}"
-            raise OSError(templ.format(self, cmd, proc.returncode, stdout_data))
-
-        return stdout_data
+NODE_KEYS = {}  # type: Dict[IPAddr, paramiko.RSAKey]
 
 
-class SSHHost(interfaces.IHost):
-    def __init__(self, ssh_conn, node_name: str, ip: str) -> None:
-        self.conn = ssh_conn
-        self.node_name = node_name
-        self.ip = ip
-
-    def get_ip(self) -> str:
-        return self.ip
-
-    def __str__(self) -> str:
-        return self.node_name
-
-    def put_to_file(self, path: str, content: bytes) -> None:
-        with self.conn.open_sftp() as sftp:
-            with sftp.open(path, "wb") as fd:
-                fd.write(content)
-
-    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
-        transport = self.conn.get_transport()
-        session = transport.open_session()
-
-        try:
-            session.set_combine_stderr(True)
-
-            stime = time.time()
-
-            if not nolog:
-                logger.debug("SSH:{0} Exec {1!r}".format(self, cmd))
-
-            session.exec_command(cmd)
-            session.settimeout(1)
-            session.shutdown_write()
-            output = ""
-
-            while True:
-                try:
-                    ndata = session.recv(1024)
-                    output += ndata
-                    if "" == ndata:
-                        break
-                except socket.timeout:
-                    pass
-
-                if time.time() - stime > timeout:
-                    raise OSError(output + "\nExecution timeout")
-
-            code = session.recv_exit_status()
-        finally:
-            found = False
-
-            if found:
-                session.close()
-
-        if code != 0:
-            templ = "SSH:{0} Cmd {1!r} failed with code {2}. Output: {3}"
-            raise OSError(templ.format(self, cmd, code, output))
-
-        return output
+def set_key_for_node(host_port: IPAddr, key: bytes) -> None:
+    with BytesIO(key) as sio:
+        NODE_KEYS[host_port] = paramiko.RSAKey.from_private_key(sio)
 
 
-NODE_KEYS = {}  # type: Dict[Tuple[str, int], paramiko.RSAKey]
-
-
-def set_key_for_node(host_port: Tuple[str, int], key: bytes) -> None:
-    sio = BytesIO(key)
-    NODE_KEYS[host_port] = paramiko.RSAKey.from_private_key(sio)
-    sio.close()
-
-
-def ssh_connect(creds: SSHCredsType, conn_timeout: int = 60) -> interfaces.IHost:
-    if creds == 'local':
-        return LocalHost()
-
-    tcp_timeout = 15
-    default_banner_timeout = 30
+def ssh_connect(creds: ConnCreds,
+                conn_timeout: int = 60,
+                tcp_timeout: int = 15,
+                default_banner_timeout: int = 30) -> Tuple[paramiko.SSHClient, str, str]:
 
     ssh = paramiko.SSHClient()
     ssh.load_host_keys('/dev/null')
@@ -223,8 +116,6 @@
             if paramiko.__version_info__ >= (1, 15, 2):
                 banner_timeout_arg['banner_timeout'] = int(min(default_banner_timeout, time_left))
 
-            creds = cast(ConnCreds, creds)
-
             if creds.passwd is not None:
                 ssh.connect(creds.host,
                             timeout=c_tcp_timeout,
@@ -259,7 +150,7 @@
                             look_for_keys=False,
                             port=creds.port,
                             **banner_timeout_arg)
-            return SSHHost(ssh, "{0.host}:{0.port}".format(creds), creds.host)
+            return ssh, "{0.host}:{0.port}".format(creds), creds.host
         except paramiko.PasswordRequiredException:
             raise
         except (socket.error, paramiko.SSHException):
@@ -268,68 +159,35 @@
             time.sleep(1)
 
 
-def connect(uri: str, **params) -> interfaces.IHost:
-    if uri == 'local':
-        res = LocalHost()
-    else:
-        creds = parse_ssh_uri(uri)
-        creds.port = int(creds.port)
-        res = ssh_connect(creds, **params)
-    return res
-
-
-SetupResult = Tuple[interfaces.IRPC, Dict[str, Any]]
-
-
-RPCBeforeConnCallback = Callable[[interfaces.IHost, int], None]
-
-
-def setup_rpc(node: interfaces.IHost,
-              rpc_server_code: bytes,
-              port: int = 0,
-              rpc_conn_callback: RPCBeforeConnCallback = None) -> SetupResult:
-    code_file = node.run("mktemp").strip()
-    log_file = node.run("mktemp").strip()
-    node.put_to_file(code_file, rpc_server_code)
-    cmd = "python {code_file} server --listen-addr={listen_ip}:{port} --daemon " + \
-          "--show-settings --stdout-file={out_file}"
-    params_js = node.run(cmd.format(code_file=code_file,
-                                    listen_addr=node.get_ip(),
-                                    out_file=log_file,
-                                    port=port)).strip()
-    params = json.loads(params_js)
-    params['log_file'] = log_file
-
-    if rpc_conn_callback:
-        ip, port = rpc_conn_callback(node, port)
-    else:
-        ip = node.get_ip()
-        port = int(params['addr'].split(":")[1])
-
-    return agent.connect((ip, port)), params
-
-
-def wait_ssh_awailable(addrs: List[Tuple[str, int]],
+def wait_ssh_available(addrs: List[IPAddr],
                        timeout: int = 300,
-                       tcp_timeout: float = 1.0,
-                       max_threads: int = 32) -> None:
-    addrs = addrs[:]
-    tout = utils.Timeout(timeout)
+                       tcp_timeout: float = 1.0) -> None:
+    addrs = set(addrs)
+    for _ in utils.Timeout(timeout):
+        with selectors.DefaultSelector() as selector:  # type: selectors.BaseSelector
+            for addr in addrs:
+                sock = socket.socket()
+                sock.setblocking(False)
+                try:
+                    sock.connect(addr)
+                except BlockingIOError:
+                    pass
+                selector.register(sock, selectors.EVENT_READ, data=addr)
 
-    def check_sock(addr):
-        s = socket.socket()
-        s.settimeout(tcp_timeout)
-        try:
-            s.connect(addr)
-            return True
-        except (socket.timeout, ConnectionRefusedError):
-            return False
+            etime = time.time() + tcp_timeout
+            ltime = etime - time.time()
+            while ltime > 0:
+                for key, _ in selector.select(timeout=ltime):
+                    selector.unregister(key.fileobj)
+                    try:
+                        key.fileobj.getpeername()
+                        addrs.remove(key.data)
+                    except OSError as exc:
+                        if exc.errno == errno.ENOTCONN:
+                            pass
+                ltime = etime - time.time()
 
-    with ThreadPoolExecutor(max_workers=max_threads) as pool:
-        while addrs:
-            check_result = pool.map(check_sock, addrs)
-            addrs = [addr for ok, addr in zip(check_result, addrs) if not ok]  # type: List[Tuple[str, int]]
-            tout.tick()
-
+        if not addrs:
+            break
 
 
diff --git a/wally/start_vms.py b/wally/start_vms.py
index 075f348..af81463 100644
--- a/wally/start_vms.py
+++ b/wally/start_vms.py
@@ -2,22 +2,28 @@
 import os
 import stat
 import time
-import urllib
 import os.path
 import logging
-
-from typing import Dict, Any, Iterable, Generator, NamedTuple
+import tempfile
+import subprocess
+import urllib.request
+from typing import Dict, Any, Iterable, Iterator, NamedTuple, Optional, List, Tuple
 from concurrent.futures import ThreadPoolExecutor
 
+from keystoneauth1 import loading, session
 from novaclient.exceptions import NotFound
-from novaclient.client import Client as n_client
-from cinderclient.v1.client import Client as c_client
+from novaclient.client import Client as NovaClient
+from cinderclient.client import Client as CinderClient
+from glanceclient import Client as GlanceClient
 
-from .inode import NodeInfo
+
+from .utils import Timeout
+from .node_interfaces import NodeInfo
+
 
 __doc__ = """
 Module used to reliably spawn set of VM's, evenly distributed across
-openstack cluster. Main functions:
+compute servers in openstack cluster. Main functions:
 
     get_OS_credentials - extract openstack credentials from different sources
     nova_connect - connect to nova api
@@ -32,15 +38,6 @@
 logger = logging.getLogger("wally.vms")
 
 
-STORED_OPENSTACK_CREDS = None
-NOVA_CONNECTION = None
-CINDER_CONNECTION = None
-
-
-def is_connected() -> bool:
-    return NOVA_CONNECTION is not None
-
-
 OSCreds = NamedTuple("OSCreds",
                      [("name", str),
                       ("passwd", str),
@@ -49,57 +46,41 @@
                       ("insecure", bool)])
 
 
-def ostack_get_creds() -> OSCreds:
-    if STORED_OPENSTACK_CREDS is None:
-        is_insecure = \
-            os.environ.get('OS_INSECURE', 'False').lower() in ('true', 'yes')
-        return OSCreds(os.environ.get('OS_USERNAME'),
-                       os.environ.get('OS_PASSWORD'),
-                       os.environ.get('OS_TENANT_NAME'),
-                       os.environ.get('OS_AUTH_URL'),
-                       is_insecure)
-    else:
-        return STORED_OPENSTACK_CREDS
+# TODO(koder): should correctly process different sources, not only env????
+def get_openstack_credentials() -> OSCreds:
+    is_insecure = os.environ.get('OS_INSECURE', 'false').lower() in ('true', 'yes')
+
+    return OSCreds(os.environ.get('OS_USERNAME'),
+                   os.environ.get('OS_PASSWORD'),
+                   os.environ.get('OS_TENANT_NAME'),
+                   os.environ.get('OS_AUTH_URL'),
+                   is_insecure)
 
 
-def nova_connect(os_creds: OSCreds=None) -> n_client:
-    global NOVA_CONNECTION
-    global STORED_OPENSTACK_CREDS
-
-    if NOVA_CONNECTION is None:
-        if os_creds is None:
-            os_creds = ostack_get_creds()
-        else:
-            STORED_OPENSTACK_CREDS = os_creds
-
-        NOVA_CONNECTION = n_client('1.1',
-                                   os_creds.name,
-                                   os_creds.passwd,
-                                   os_creds.tenant,
-                                   os_creds.auth_url,
-                                   insecure=os_creds.insecure)
-    return NOVA_CONNECTION
+class OSConnection:
+    def __init__(self, nova: NovaClient, cinder: CinderClient, glance: GlanceClient) -> None:
+        self.nova = nova
+        self.cinder = cinder
+        self.glance = glance
 
 
-def cinder_connect(os_creds: OSCreds=None) -> c_client:
-    global CINDER_CONNECTION
-    global STORED_OPENSTACK_CREDS
+def os_connect(os_creds: OSCreds, version: str = "2") -> OSConnection:
+    loader = loading.get_plugin_loader('password')
+    auth = loader.load_from_options(auth_url=os_creds.auth_url,
+                                    username=os_creds.name,
+                                    password=os_creds.passwd,
+                                    project_id=os_creds.tenant)
+    auth_sess = session.Session(auth=auth)
 
-    if CINDER_CONNECTION is None:
-        if os_creds is None:
-            os_creds = ostack_get_creds()
-        else:
-            STORED_OPENSTACK_CREDS = os_creds
-        CINDER_CONNECTION = c_client(os_creds.name,
-                                     os_creds.passwd,
-                                     os_creds.tenant,
-                                     os_creds.auth_url,
-                                     insecure=os_creds.insecure)
-    return CINDER_CONNECTION
+    glance = GlanceClient(version, session=auth_sess)
+    nova = NovaClient(version, session=auth_sess)
+    cinder = CinderClient(os_creds.name, os_creds.passwd, os_creds.tenant, os_creds.auth_url,
+                          insecure=os_creds.insecure, api_version=version)
+    return OSConnection(nova, cinder, glance)
 
 
-def find_vms(nova: n_client, name_prefix: str) -> Iterable[str, int]:
-    for srv in nova.servers.list():
+def find_vms(conn: OSConnection, name_prefix: str) -> Iterable[str, int]:
+    for srv in conn.nova.servers.list():
         if srv.name.startswith(name_prefix):
             for ips in srv.addresses.values():
                 for ip in ips:
@@ -108,43 +89,33 @@
                         break
 
 
-def pause(ids: Iterable[str]) -> None:
-    def pause_vm(conn: n_client, vm_id: str) -> None:
-        vm = conn.servers.get(vm_id)
+def pause(conn: OSConnection, ids: Iterable[int], executor: ThreadPoolExecutor) -> None:
+    def pause_vm(vm_id: str) -> None:
+        vm = conn.nova.servers.get(vm_id)
         if vm.status == 'ACTIVE':
             vm.pause()
 
-    conn = nova_connect()
-    with ThreadPoolExecutor(max_workers=16) as executor:
-        futures = [executor.submit(pause_vm, conn, vm_id)
-                   for vm_id in ids]
-        for future in futures:
-            future.result()
+    for future in executor.map(pause_vm, ids):
+        future.result()
 
 
-def unpause(ids: Iterable[str], max_resume_time=10) -> None:
-    def unpause(conn: n_client, vm_id: str) -> None:
-        vm = conn.servers.get(vm_id)
+def unpause(conn: OSConnection, ids: Iterable[int], executor: ThreadPoolExecutor, max_resume_time=10) -> None:
+    def unpause(vm_id: str) -> None:
+        vm = conn.nova.servers.get(vm_id)
         if vm.status == 'PAUSED':
             vm.unpause()
 
-        for i in range(max_resume_time * 10):
-            vm = conn.servers.get(vm_id)
+        for _ in Timeout(max_resume_time):
+            vm = conn.nova.servers.get(vm_id)
             if vm.status != 'PAUSED':
                 return
-            time.sleep(0.1)
         raise RuntimeError("Can't unpause vm {0}".format(vm_id))
 
-    conn = nova_connect()
-    with ThreadPoolExecutor(max_workers=16) as executor:
-        futures = [executor.submit(unpause, conn, vm_id)
-                   for vm_id in ids]
-
-        for future in futures:
-            future.result()
+    for future in executor.map(unpause, ids):
+        future.result()
 
 
-def prepare_os(nova: n_client, params: Dict[str, Any], os_creds: OSCreds) -> None:
+def prepare_os(conn: OSConnection, params: Dict[str, Any], max_vm_per_node: int = 8) -> None:
     """prepare openstack for futher usage
 
     Creates server groups, security rules, keypair, flavor
@@ -153,7 +124,7 @@
     Don't check, that existing object has required attributes
 
     params:
-        nova: novaclient connection
+        nova: OSConnection
         params: dict {
             security_group:str - security group name with allowed ssh and ping
             aa_group_name:str - template for anti-affinity group names. Should
@@ -174,30 +145,18 @@
         max_vm_per_compute: int=8 maximum expected amount of VM, per
                             compute host. Used to create appropriate
                             count of server groups for even placement
-
-    returns: None
     """
-    allow_ssh(nova, params['security_group'])
+    allow_ssh_and_ping(conn, params['security_group'])
 
-    MAX_VM_PER_NODE = 8
-    serv_groups = map(params['aa_group_name'].format,
-                      range(MAX_VM_PER_NODE))
+    for idx in range(max_vm_per_node):
+        get_or_create_aa_group(conn, params['aa_group_name'].format(idx))
 
-    for serv_groups in serv_groups:
-        get_or_create_aa_group(nova, serv_groups)
-
-    create_keypair(nova,
-                   params['keypair_name'],
-                   params['keypair_file_public'],
-                   params['keypair_file_private'])
-
-    create_image(os_creds, nova, params['image']['name'],
-                 params['image']['url'])
-
-    create_flavor(nova, **params['flavor'])
+    create_keypair(conn, params['keypair_name'], params['keypair_file_public'], params['keypair_file_private'])
+    create_image(conn, params['image']['name'], params['image']['url'])
+    create_flavor(conn, **params['flavor'])
 
 
-def create_keypair(nova: n_client, name: str, pub_key_path: str, priv_key_path: str):
+def create_keypair(conn: OSConnection, name: str, pub_key_path: str, priv_key_path: str):
     """create and upload keypair into nova, if doesn't exists yet
 
     Create and upload keypair into nova, if keypair with given bane
@@ -205,19 +164,17 @@
     create new keys, and store'em into files.
 
     parameters:
-        nova: nova connection
+        conn: OSConnection
         name: str - ketpair name
         pub_key_path: str - path for public key
         priv_key_path: str - path for private key
-
-    returns: None
     """
 
     pub_key_exists = os.path.exists(pub_key_path)
     priv_key_exists = os.path.exists(priv_key_path)
 
     try:
-        kpair = nova.keypairs.find(name=name)
+        kpair = conn.nova.keypairs.find(name=name)
         # if file not found- delete and recreate
     except NotFound:
         kpair = None
@@ -231,9 +188,9 @@
     if kpair is None:
         if pub_key_exists:
             with open(pub_key_path) as pub_key_fd:
-                return nova.keypairs.create(name, pub_key_fd.read())
+                return conn.nova.keypairs.create(name, pub_key_fd.read())
         else:
-            key = nova.keypairs.create(name)
+            key = conn.nova.keypairs.create(name)
 
             with open(priv_key_path, "w") as priv_key_fd:
                 priv_key_fd.write(key.private_key)
@@ -248,54 +205,50 @@
                                " or remove key from openstack")
 
 
-def get_or_create_aa_group(nova: n_client, name: str) -> int:
+def get_or_create_aa_group(conn: OSConnection, name: str) -> int:
     """create anti-affinity server group, if doesn't exists yet
 
     parameters:
-        nova: nova connection
+        conn: OSConnection
         name: str - group name
 
     returns: str - group id
     """
     try:
-        group = nova.server_groups.find(name=name)
+        return conn.nova.server_groups.find(name=name).id
     except NotFound:
-        group = nova.server_groups.create(name=name,
-                                          policies=['anti-affinity'])
-
-    return group.id
+        return conn.nova.server_groups.create(name=name, policies=['anti-affinity']).id
 
 
-def allow_ssh(nova: n_client, group_name: str) -> int:
+def allow_ssh_and_ping(conn: OSConnection, group_name: str) -> int:
     """create sequrity group for ping and ssh
 
     parameters:
-        nova: nova connection
+        conn:
         group_name: str - group name
 
     returns: str - group id
     """
     try:
-        secgroup = nova.security_groups.find(name=group_name)
+        secgroup = conn.nova.security_groups.find(name=group_name)
     except NotFound:
-        secgroup = nova.security_groups.create(group_name,
-                                               "allow ssh/ping to node")
+        secgroup = conn.nova.security_groups.create(group_name, "allow ssh/ping to node")
 
-        nova.security_group_rules.create(secgroup.id,
-                                         ip_protocol="tcp",
-                                         from_port="22",
-                                         to_port="22",
-                                         cidr="0.0.0.0/0")
+        conn.nova.security_group_rules.create(secgroup.id,
+                                              ip_protocol="tcp",
+                                              from_port="22",
+                                              to_port="22",
+                                              cidr="0.0.0.0/0")
 
-        nova.security_group_rules.create(secgroup.id,
-                                         ip_protocol="icmp",
-                                         from_port=-1,
-                                         cidr="0.0.0.0/0",
-                                         to_port=-1)
+        conn.nova.security_group_rules.create(secgroup.id,
+                                              ip_protocol="icmp",
+                                              from_port=-1,
+                                              cidr="0.0.0.0/0",
+                                              to_port=-1)
     return secgroup.id
 
 
-def create_image(nova: n_client, os_creds: OSCreds, name: str, url: str):
+def create_image(conn: OSConnection, name: str, url: str) -> None:
     """upload image into glance from given URL, if given image doesn't exisis yet
 
     parameters:
@@ -308,33 +261,31 @@
     returns: None
     """
     try:
-        nova.images.find(name=name)
+        conn.nova.images.find(name=name)
         return
     except NotFound:
         pass
 
-    tempnam = os.tempnam()
+    ok = False
+    with tempfile.NamedTemporaryFile() as temp_fd:
+        try:
+            cmd = "wget --dns-timeout=30 --connect-timeout=30 --read-timeout=30 -o {} {}"
+            subprocess.check_call(cmd.format(temp_fd.name, url))
+            ok = True
 
-    try:
-        urllib.urlretrieve(url, tempnam)
+        # TODO(koder): add proper error handling
+        except Exception:
+            pass
 
-        cmd = "OS_USERNAME={0.name}"
-        cmd += " OS_PASSWORD={0.passwd}"
-        cmd += " OS_TENANT_NAME={0.tenant}"
-        cmd += " OS_AUTH_URL={0.auth_url}"
-        cmd += " glance {1} image-create --name {2} $opts --file {3}"
-        cmd += " --disk-format qcow2 --container-format bare --is-public true"
+        if not ok:
+            urllib.request.urlretrieve(url, temp_fd.name)
 
-        cmd = cmd.format(os_creds,
-                         '--insecure' if os_creds.insecure else "",
-                         name,
-                         tempnam)
-    finally:
-        if os.path.exists(tempnam):
-            os.unlink(tempnam)
+        image = conn.glance.images.create(name=name)
+        with open(temp_fd.name, 'rb') as fd:
+            conn.glance.images.upload(image.id, fd)
 
 
-def create_flavor(nova: n_client, name: str, ram_size: int, hdd_size: int, cpu_count: int):
+def create_flavor(conn: OSConnection, name: str, ram_size: int, hdd_size: int, cpu_count: int) -> None:
     """create flavor, if doesn't exisis yet
 
     parameters:
@@ -347,17 +298,16 @@
     returns: None
     """
     try:
-        nova.flavors.find(name)
+        conn.nova.flavors.find(name)
         return
     except NotFound:
         pass
 
-    nova.flavors.create(name, cpu_count, ram_size, hdd_size)
+    conn.nova.flavors.create(name, cpu_count, ram_size, hdd_size)
 
 
-def create_volume(size: int, name: str):
-    cinder = cinder_connect()
-    vol = cinder.volumes.create(size=size, display_name=name)
+def create_volume(conn: OSConnection, size: int, name: str) -> Any:
+    vol = conn.cinder.volumes.create(size=size, display_name=name)
     err_count = 0
 
     while vol.status != 'available':
@@ -367,16 +317,16 @@
                 raise RuntimeError("Fail to create volume")
             else:
                 err_count += 1
-                cinder.volumes.delete(vol)
+                conn.cinder.volumes.delete(vol)
                 time.sleep(1)
-                vol = cinder.volumes.create(size=size, display_name=name)
+                vol = conn.cinder.volumes.create(size=size, display_name=name)
                 continue
         time.sleep(1)
-        vol = cinder.volumes.get(vol.id)
+        vol = conn.cinder.volumes.get(vol.id)
     return vol
 
 
-def wait_for_server_active(nova: n_client, server, timeout: int=300)-> None:
+def wait_for_server_active(conn: OSConnection, server: Any, timeout: int = 300)-> None:
     """waiting till server became active
 
     parameters:
@@ -387,29 +337,25 @@
     returns: None
     """
 
-    t = time.time()
-    while True:
-        time.sleep(1)
-        sstate = getattr(server, 'OS-EXT-STS:vm_state').lower()
+    for _ in Timeout(timeout, no_exc=True):
+        server_state = getattr(server, 'OS-EXT-STS:vm_state').lower()
 
-        if sstate == 'active':
+        if server_state == 'active':
             return True
 
-        if sstate == 'error':
+        if server_state == 'error':
             return False
 
-        if time.time() - t > timeout:
-            return False
-
-        server = nova.servers.get(server)
+        server = conn.nova.servers.get(server)
+    return False
 
 
 class Allocate(object):
     pass
 
 
-def get_floating_ips(nova, pool, amount):
-    """allocate flationg ips
+def get_floating_ips(conn: OSConnection, pool: Optional[str], amount: int) -> List[str]:
+    """allocate floating ips
 
     parameters:
         nova: nova connection
@@ -418,7 +364,7 @@
 
     returns: [ip object]
     """
-    ip_list = nova.floating_ips.list()
+    ip_list = conn.nova.floating_ips.list()
 
     if pool is not None:
         ip_list = [ip for ip in ip_list if ip.pool == pool]
@@ -426,7 +372,10 @@
     return [ip for ip in ip_list if ip.instance_id is None][:amount]
 
 
-def launch_vms(nova, params, already_has_count=0) -> Iterator[NodeInfo]:
+def launch_vms(conn: OSConnection,
+               params: Dict[str, Any],
+               executor: ThreadPoolExecutor,
+               already_has_count: int = 0) -> Iterator[NodeInfo]:
     """launch virtual servers
 
     Parameters:
@@ -454,13 +403,12 @@
         already_has_count: int=0 - how many servers already exists. Used to distribute
                                    new servers evenly across all compute nodes, taking
                                    old server in accout
-    returns: generator of str - server credentials, in format USER@IP:KEY_PATH
+    returns: generator of NodeInfo - server credentials, in format USER@IP:KEY_PATH
 
     """
     logger.debug("Calculating new vm count")
-    count = params['count']
-    nova = nova_connect()
-    lst = nova.services.list(binary='nova-compute')
+    count = params['count']  # type: int
+    lst = conn.nova.services.list(binary='nova-compute')
     srv_count = len([srv for srv in lst if srv.status == 'enabled'])
 
     if isinstance(count, str):
@@ -500,12 +448,14 @@
     private_key_path = params['keypair_file_private']
     creds = params['image']['creds']
 
-    for ip, os_node in create_vms_mt(NOVA_CONNECTION, count, **vm_params):
+    for ip, os_node in create_vms_mt(conn, count, executor, **vm_params):
         conn_uri = creds.format(ip=ip, private_key_path=private_key_path)
-        yield NodeInfo(conn_uri, []), os_node.id
+        info = NodeInfo(conn_uri, set())
+        info.os_vm_id = os_node.id
+        yield info
 
 
-def get_free_server_grpoups(nova, template):
+def get_free_server_groups(conn: OSConnection, template: str) -> Iterator[str]:
     """get fre server groups, that match given name template
 
     parameters:
@@ -515,113 +465,117 @@
 
     returns: generator or str - server group names
     """
-    for g in nova.server_groups.list():
-        if g.members == []:
-            if re.match(template, g.name):
-                yield str(g.id)
+    for server_group in conn.nova.server_groups.list():
+        if not server_group.members:
+            if re.match(template, server_group.name):
+                yield str(server_group.id)
 
 
-def create_vms_mt(nova, amount, group_name, keypair_name, img_name,
-                  flavor_name, vol_sz=None, network_zone_name=None,
-                  flt_ip_pool=None, name_templ='wally-{id}',
-                  scheduler_hints=None, security_group=None,
-                  sec_group_size=None):
+def create_vms_mt(conn: OSConnection,
+                  amount: int,
+                  executor: ThreadPoolExecutor,
+                  group_name: str,
+                  keypair_name: str,
+                  img_name: str,
+                  flavor_name: str,
+                  vol_sz: int = None,
+                  network_zone_name: str = None,
+                  flt_ip_pool: str = None,
+                  name_templ: str ='wally-{id}',
+                  scheduler_hints: Dict = None,
+                  security_group: str = None,
+                  sec_group_size: int = None) -> List[Tuple[str, Any]]:
 
-    with ThreadPoolExecutor(max_workers=16) as executor:
-        if network_zone_name is not None:
-            network_future = executor.submit(nova.networks.find,
-                                             label=network_zone_name)
-        else:
-            network_future = None
+    if network_zone_name is not None:
+        network_future = executor.submit(conn.nova.networks.find,
+                                         label=network_zone_name)
+    else:
+        network_future = None
 
-        fl_future = executor.submit(nova.flavors.find, name=flavor_name)
-        img_future = executor.submit(nova.images.find, name=img_name)
+    fl_future = executor.submit(conn.nova.flavors.find, name=flavor_name)
+    img_future = executor.submit(conn.nova.images.find, name=img_name)
 
-        if flt_ip_pool is not None:
-            ips_future = executor.submit(get_floating_ips,
-                                         nova, flt_ip_pool, amount)
-            logger.debug("Wait for floating ip")
-            ips = ips_future.result()
-            ips += [Allocate] * (amount - len(ips))
-        else:
-            ips = [None] * amount
+    if flt_ip_pool is not None:
+        ips_future = executor.submit(get_floating_ips,
+                                     conn, flt_ip_pool, amount)
+        logger.debug("Wait for floating ip")
+        ips = ips_future.result()
+        ips += [Allocate] * (amount - len(ips))
+    else:
+        ips = [None] * amount
 
-        logger.debug("Getting flavor object")
-        fl = fl_future.result()
-        logger.debug("Getting image object")
-        img = img_future.result()
+    logger.debug("Getting flavor object")
+    fl = fl_future.result()
+    logger.debug("Getting image object")
+    img = img_future.result()
 
-        if network_future is not None:
-            logger.debug("Waiting for network results")
-            nics = [{'net-id': network_future.result().id}]
-        else:
-            nics = None
+    if network_future is not None:
+        logger.debug("Waiting for network results")
+        nics = [{'net-id': network_future.result().id}]
+    else:
+        nics = None
 
-        names = []
-        for i in range(amount):
-            names.append(name_templ.format(group=group_name, id=i))
+    names = []  # type: List[str]
+    for i in range(amount):
+        names.append(name_templ.format(group=group_name, id=i))
 
-        futures = []
-        logger.debug("Requesting new vm's")
+    futures = []
+    logger.debug("Requesting new vm's")
 
-        orig_scheduler_hints = scheduler_hints.copy()
+    orig_scheduler_hints = scheduler_hints.copy()
+    group_name_template = scheduler_hints['group'].format("\\d+")
+    groups = list(get_free_server_groups(conn, group_name_template + "$"))
+    groups.sort()
 
-        MAX_SHED_GROUPS = 32
-        for start_idx in range(MAX_SHED_GROUPS):
-            pass
+    for idx, (name, flt_ip) in enumerate(zip(names, ips), 2):
 
-        group_name_template = scheduler_hints['group'].format("\\d+")
-        groups = list(get_free_server_grpoups(nova, group_name_template + "$"))
-        groups.sort()
-
-        for idx, (name, flt_ip) in enumerate(zip(names, ips), 2):
-
-            scheduler_hints = None
-            if orig_scheduler_hints is not None and sec_group_size is not None:
-                if "group" in orig_scheduler_hints:
-                    scheduler_hints = orig_scheduler_hints.copy()
-                    scheduler_hints['group'] = groups[idx // sec_group_size]
-
-            if scheduler_hints is None:
+        scheduler_hints = None
+        if orig_scheduler_hints is not None and sec_group_size is not None:
+            if "group" in orig_scheduler_hints:
                 scheduler_hints = orig_scheduler_hints.copy()
+                scheduler_hints['group'] = groups[idx // sec_group_size]
 
-            params = (nova, name, keypair_name, img, fl,
-                      nics, vol_sz, flt_ip, scheduler_hints,
-                      flt_ip_pool, [security_group])
+        if scheduler_hints is None:
+            scheduler_hints = orig_scheduler_hints.copy()
 
-            futures.append(executor.submit(create_vm, *params))
-        res = [future.result() for future in futures]
-        logger.debug("Done spawning")
-        return res
+        params = (conn, name, keypair_name, img, fl,
+                  nics, vol_sz, flt_ip, scheduler_hints,
+                  flt_ip_pool, [security_group])
+
+        futures.append(executor.submit(create_vm, *params))
+    res = [future.result() for future in futures]
+    logger.debug("Done spawning")
+    return res
 
 
-def create_vm(nova, name, keypair_name, img,
-              fl, nics, vol_sz=None,
-              flt_ip=False,
-              scheduler_hints=None,
-              pool=None,
-              security_groups=None):
-    for i in range(3):
-        srv = nova.servers.create(name,
-                                  flavor=fl,
-                                  image=img,
-                                  nics=nics,
-                                  key_name=keypair_name,
-                                  scheduler_hints=scheduler_hints,
-                                  security_groups=security_groups)
+def create_vm(conn: OSConnection,
+              name: str,
+              keypair_name: str,
+              img: Any,
+              flavor: Any,
+              nics: List,
+              vol_sz: int = None,
+              flt_ip: Any = False,
+              scheduler_hints: Dict = None,
+              pool: str = None,
+              security_groups=None,
+              max_retry: int = 3,
+              delete_timeout: int = 120) -> Tuple[str, Any]:
 
-        if not wait_for_server_active(nova, srv):
+    # make mypy/pylint happy
+    srv = None  # type: Any
+    for i in range(max_retry):
+        srv = conn.nova.servers.create(name, flavor=flavor, image=img, nics=nics, key_name=keypair_name,
+                                       scheduler_hints=scheduler_hints, security_groups=security_groups)
+
+        if not wait_for_server_active(conn, srv):
             msg = "Server {0} fails to start. Kill it and try again"
             logger.debug(msg.format(srv))
-            nova.servers.delete(srv)
+            conn.nova.servers.delete(srv)
 
             try:
-                for j in range(120):
-                    srv = nova.servers.get(srv.id)
-                    time.sleep(1)
-                else:
-                    msg = "Server {0} delete timeout".format(srv.id)
-                    raise RuntimeError(msg)
+                for _ in Timeout(delete_timeout, "Server {0} delete timeout".format(srv.id)):
+                    srv = conn.nova.servers.get(srv.id)
             except NotFound:
                 pass
         else:
@@ -630,27 +584,22 @@
         raise RuntimeError("Failed to start server".format(srv.id))
 
     if vol_sz is not None:
-        vol = create_volume(vol_sz, name)
-        nova.volumes.create_server_volume(srv.id, vol.id, None)
+        vol = create_volume(conn, vol_sz, name)
+        conn.nova.volumes.create_server_volume(srv.id, vol.id, None)
 
     if flt_ip is Allocate:
-        flt_ip = nova.floating_ips.create(pool)
+        flt_ip = conn.nova.floating_ips.create(pool)
 
     if flt_ip is not None:
         srv.add_floating_ip(flt_ip)
 
-    return flt_ip.ip, nova.servers.get(srv.id)
+    return flt_ip.ip, conn.nova.servers.get(srv.id)
 
 
-def clear_nodes(nodes_ids):
-    clear_all(NOVA_CONNECTION, nodes_ids, None)
-
-
-MAX_SERVER_DELETE_TIME = 120
-
-
-def clear_all(nova, ids=None, name_templ=None,
-              max_server_delete_time=MAX_SERVER_DELETE_TIME):
+def clear_nodes(conn: OSConnection,
+                ids: List[int] = None,
+                name_templ: str = None,
+                max_server_delete_time: int = 120):
     try:
         def need_delete(srv):
             if name_templ is not None:
@@ -659,43 +608,42 @@
                 return srv.id in ids
 
         volumes_to_delete = []
-        cinder = cinder_connect()
-        for vol in cinder.volumes.list():
+        for vol in conn.cinder.volumes.list():
             for attachment in vol.attachments:
                 if attachment['server_id'] in ids:
                     volumes_to_delete.append(vol)
                     break
 
-        deleted_srvs = set()
-        for srv in nova.servers.list():
+        still_alive = set()
+        for srv in conn.nova.servers.list():
             if need_delete(srv):
                 logger.debug("Deleting server {0}".format(srv.name))
-                nova.servers.delete(srv)
-                deleted_srvs.add(srv.id)
+                conn.nova.servers.delete(srv)
+                still_alive.add(srv.id)
 
-        count = 0
-        while count < max_server_delete_time:
-            if count % 60 == 0:
-                logger.debug("Waiting till all servers are actually deleted")
-            all_id = set(srv.id for srv in nova.servers.list())
-            if len(all_id.intersection(deleted_srvs)) == 0:
-                break
-            count += 1
-            time.sleep(1)
-        else:
-            logger.warning("Failed to remove servers. " +
-                           "You, probably, need to remove them manually")
-            return
-        logger.debug("Done, deleting volumes")
+        if still_alive:
+            logger.debug("Waiting till all servers are actually deleted")
+            tout = Timeout(max_server_delete_time, no_exc=True)
+            while tout.tick() and still_alive:
+                all_id = set(srv.id for srv in conn.nova.servers.list())
+                still_alive = still_alive.intersection(all_id)
 
-        # wait till vm actually deleted
+            if still_alive:
+                logger.warning("Failed to remove servers {}. ".format(",".join(still_alive)) +
+                               "You, probably, need to remove them manually (and volumes as well)")
+                return
 
-        # logger.warning("Volume deletion commented out")
-        for vol in volumes_to_delete:
-            logger.debug("Deleting volume " + vol.display_name)
-            cinder.volumes.delete(vol)
+        if volumes_to_delete:
+            logger.debug("Deleting volumes")
 
-        logger.debug("Clearing done (yet some volumes may still deleting)")
-    except:
+            # wait till vm actually deleted
+
+            # logger.warning("Volume deletion commented out")
+            for vol in volumes_to_delete:
+                logger.debug("Deleting volume " + vol.display_name)
+                conn.cinder.volumes.delete(vol)
+
+        logger.debug("Clearing complete (yet some volumes may still be deleting)")
+    except Exception:
         logger.exception("During removing servers. " +
                          "You, probably, need to remove them manually")
diff --git a/wally/storage.py b/wally/storage.py
index 5212f4a..02de173 100644
--- a/wally/storage.py
+++ b/wally/storage.py
@@ -2,8 +2,9 @@
 This module contains interfaces for storage classes
 """
 
+import os
 import abc
-from typing import Any, Iterable, TypeVar, Type, IO
+from typing import Any, Iterable, TypeVar, Type, IO, Tuple, Union, Dict, List
 
 
 class IStorable(metaclass=abc.ABCMeta):
@@ -32,46 +33,11 @@
 ObjClass = TypeVar('ObjClass')
 
 
-class IStorage(metaclass=abc.ABCMeta):
-    """interface for storage"""
-    @abc.abstractmethod
-    def __init__(self, path: str, existing_storage: bool = False) -> None:
-        pass
-
-    @abc.abstractmethod
-    def __setitem__(self, path: str, value: IStorable) -> None:
-        pass
-
-    @abc.abstractmethod
-    def __getitem__(self, path: str) -> IStorable:
-        pass
-
-    @abc.abstractmethod
-    def __contains__(self, path: str) -> bool:
-        pass
-
-    @abc.abstractmethod
-    def list(self, path: str) -> Iterable[str]:
-        pass
-
-    @abc.abstractmethod
-    def load(self, path: str, obj_class: Type[ObjClass]) -> ObjClass:
-        pass
-
-    @abc.abstractmethod
-    def get_stream(self, path: str) -> IO:
-        pass
-
-
 class ISimpleStorage(metaclass=abc.ABCMeta):
     """interface for low-level storage, which doesn't support serialization
     and can operate only on bytes"""
 
     @abc.abstractmethod
-    def __init__(self, path: str) -> None:
-        pass
-
-    @abc.abstractmethod
     def __setitem__(self, path: str, value: bytes) -> None:
         pass
 
@@ -103,13 +69,47 @@
         pass
 
 
-# TODO(koder): this is concrete storage and serializer classes to be implemented
-class FSStorage(IStorage):
+class FSStorage(ISimpleStorage):
     """Store all data in files on FS"""
 
+    def __init__(self, root_path: str, existing: bool) -> None:
+        self.root_path = root_path
+        if existing:
+            if not os.path.isdir(self.root_path):
+                raise ValueError("No storage found at {!r}".format(root_path))
+
+    def ensure_dir(self, path):
+        os.makedirs(path, exist_ok=True)
+
     @abc.abstractmethod
-    def __init__(self, root_path: str, serializer: ISerializer, existing: bool = False) -> None:
-        pass
+    def __setitem__(self, path: str, value: bytes) -> None:
+        path = os.path.join(self.root_path, path)
+        self.ensure_dir(os.path.dirname(path))
+        with open(path, "wb") as fd:
+            fd.write(value)
+
+    @abc.abstractmethod
+    def __getitem__(self, path: str) -> bytes:
+        path = os.path.join(self.root_path, path)
+        with open(path, "rb") as fd:
+            return fd.read()
+
+    @abc.abstractmethod
+    def __contains__(self, path: str) -> bool:
+        path = os.path.join(self.root_path, path)
+        return os.path.exists(path)
+
+    @abc.abstractmethod
+    def list(self, path: str) -> Iterable[Tuple[bool, str]]:
+        path = os.path.join(self.root_path, path)
+        for entry in os.scandir(path):
+            if not entry.name in ('..', '.'):
+                yield entry.is_file(), entry.name
+
+    @abc.abstractmethod
+    def get_stream(self, path: str, mode: str = "rb") -> IO:
+        path = os.path.join(self.root_path, path)
+        return open(path, mode)
 
 
 class YAMLSerializer(ISerializer):
@@ -117,6 +117,55 @@
     pass
 
 
-def make_storage(url: str, existing: bool = False) -> IStorage:
-    return FSStorage(url, YAMLSerializer(), existing)
+ISimpleStorable = Union[Dict, List, int, str, None, bool]
+
+
+class Storage:
+    """interface for storage"""
+    def __init__(self, storage: ISimpleStorage, serializer: ISerializer):
+        self.storage = storage
+        self.serializer = serializer
+
+    def __setitem__(self, path: str, value: IStorable) -> None:
+        self.storage[path] = self.serializer.pack(value)
+
+    @abc.abstractmethod
+    def __getitem__(self, path: str) -> ISimpleStorable:
+        return self.serializer.unpack(self.storage[path])
+
+    @abc.abstractmethod
+    def __contains__(self, path: str) -> bool:
+        return path in self.storage
+
+    @abc.abstractmethod
+    def list(self, path: str) -> Iterable[Tuple[bool, str]]:
+        return self.storage.list(path)
+
+    @abc.abstractmethod
+    def load(self, path: str, obj_class: Type[ObjClass]) -> ObjClass:
+        raw_val = self[path]
+        if obj_class in (int, str, dict, list, None):
+            if not isinstance(raw_val, obj_class):
+                raise ValueError("Can't load path {!r} into type {}. Real type is {}"
+                                 .format(path, obj_class, type(raw_val)))
+            return raw_val
+
+        if not isinstance(raw_val, dict):
+            raise ValueError("Can't load path {!r} into python type. Raw value not dict".format(path))
+
+        if not all(isinstance(str, key) for key in raw_val.keys):
+            raise ValueError("Can't load path {!r} into python type.".format(path) +
+                             "Raw not all keys in raw value is strings")
+
+        obj = ObjClass.__new__(ObjClass)
+        obj.__dict__.update(raw_val)
+        return obj
+
+    @abc.abstractmethod
+    def get_stream(self, path: str) -> IO:
+        return self.storage.get_stream(path)
+
+
+def make_storage(url: str, existing: bool = False) -> Storage:
+    return Storage(FSStorage(url, existing), YAMLSerializer())
 
diff --git a/wally/suits/itest.py b/wally/suits/itest.py
index 00492c9..7004b8e 100644
--- a/wally/suits/itest.py
+++ b/wally/suits/itest.py
@@ -9,9 +9,8 @@
 
 from ..utils import Barrier, StopTestError
 from ..statistic import data_property
-from ..ssh_utils import copy_paths
 from ..inode import INode
-
+from ..storage import Storage
 
 
 logger = logging.getLogger("wally")
@@ -31,15 +30,15 @@
     def __init__(self,
                  test_type: str,
                  params: Dict[str, Any],
-                 test_uuid: str,
+                 run_uuid: str,
                  nodes: List[INode],
-                 log_directory: str,
+                 storage: Storage,
                  remote_dir: str):
         self.test_type = test_type
         self.params = params
-        self.test_uuid = test_uuid
-        self.log_directory = log_directory
+        self.run_uuid = run_uuid
         self.nodes = nodes
+        self.storage = storage
         self.remote_dir = remote_dir
 
 
@@ -200,7 +199,7 @@
         pass
 
     @abc.abstractmethod
-    def run(self) -> List[TestResults]:
+    def run(self):
         pass
 
     @abc.abstractmethod
diff --git a/wally/test_run_class.py b/wally/test_run_class.py
index e937300..cac893c 100644
--- a/wally/test_run_class.py
+++ b/wally/test_run_class.py
@@ -3,35 +3,37 @@
 
 
 from .timeseries import SensorDatastore
-from . import inode
-from .start_vms import OSCreds
-from .storage import IStorage
+from .node_interfaces import NodeInfo, IRPCNode, RPCBeforeConnCallback
+from .start_vms import OSCreds, NovaClient, CinderClient
+from .storage import Storage
 from .config import Config
 
 
 class TestRun:
     """Test run information"""
-    def __init__(self, config: Config, storage: IStorage):
+    def __init__(self, config: Config, storage: Storage):
         # NodesInfo list
-        self.nodes_info = []  # type: List[inode.NodeInfo]
+        self.nodes_info = []  # type: List[NodeInfo]
 
         # Nodes list
-        self.nodes = []  # type: List[inode.INode]
+        self.nodes = []  # type: List[IRPCNode]
 
         self.build_meta = {}  # type: Dict[str,Any]
         self.clear_calls_stack = []  # type: List[Callable[['TestRun'], None]]
-
-        # created openstack nodes
-        self.openstack_nodes_ids = []  # type: List[str]
         self.sensors_mon_q = None
 
         # openstack credentials
         self.fuel_openstack_creds = None  # type: Optional[OSCreds]
+        self.os_creds = None  # type: Optional[OSCreds]
+        self.nova_client = None  # type: Optional[NovaClient]
+        self.cinder_client = None  # type: Optional[CinderClient]
 
         self.storage = storage
         self.config = config
         self.sensors_data = SensorDatastore()
 
+        self.before_conn_callback = None  # type: RPCBeforeConnCallback
+
     def get_pool(self):
         return ThreadPoolExecutor(self.config.get('worker_pool_sz', 32))
 
diff --git a/wally/utils.py b/wally/utils.py
index d2b867e..14e3a6c 100644
--- a/wally/utils.py
+++ b/wally/utils.py
@@ -11,7 +11,7 @@
 import subprocess
 import collections
 
-from .interfaces import IRemoteNode
+from .node_interfaces import IRPCNode
 from typing import Any, Tuple, Union, List, Iterator, Dict, Callable, Iterable, Optional, IO, Sequence
 
 try:
@@ -412,15 +412,36 @@
 
 
 class Timeout:
-    def __init__(self, timeout: int, message: str = None) -> None:
+    def __init__(self, timeout: int, message: str = None, min_tick: int = 1, no_exc: bool = False) -> None:
         self.etime = time.time() + timeout
         self.message = message
+        self.min_tick = min_tick
+        self.prev_tick_at = time.time()
+        self.no_exc = no_exc
 
-    def tick(self) -> None:
-        if time.time() > self.etime:
+    def tick(self) -> bool:
+        ctime = time.time()
+        if ctime > self.etime:
             if self.message:
                 msg = "Timeout: {}".format(self.message)
             else:
                 msg = "Timeout"
 
-            raise TimeoutError(msg)
\ No newline at end of file
+            if self.no_exc:
+                return False
+            raise TimeoutError(msg)
+
+        dtime = self.min_tick - (ctime - self.prev_tick_at)
+        if dtime > 0:
+            time.sleep(dtime)
+
+        self.prev_tick_at = time.time()
+        return True
+
+    def __iter__(self):
+        return self
+
+    def __next__(self) -> float:
+        if not self.tick():
+            raise StopIteration()
+        return self.etime - time.time()