diff --git a/wally/suits/io/fio.py b/wally/suits/io/fio.py
index 77d7a75..16da091 100644
--- a/wally/suits/io/fio.py
+++ b/wally/suits/io/fio.py
@@ -168,8 +168,12 @@
                                    job_file=self.remote_task_file)
         must_be_empty = node.run(cmd, timeout=exec_time + max(300, exec_time), check_timeout=1).strip()
 
-        if must_be_empty:
-            logger.error("Unexpected fio output: %r", must_be_empty)
+        for line in must_be_empty.split("\n"):
+            if line.strip():
+                if 'only root may flush block devices' in line:
+                    continue
+                logger.error("Unexpected fio output: %r", must_be_empty)
+                break
 
         # put fio output into storage
         fio_out = node.get_file_content(self.remote_output_file)
diff --git a/wally/suits/io/fio_job.py b/wally/suits/io/fio_job.py
index 2d8d78a..39715ef 100644
--- a/wally/suits/io/fio_job.py
+++ b/wally/suits/io/fio_job.py
@@ -41,7 +41,7 @@
     @property
     def summary(self) -> str:
         """Test short summary, used mostly for file names and short image description"""
-        res = "{0[oper]}{0[sync_mode]}{0[bsize]}".format(self)
+        res = "{0[oper_short]}{0[sync_mode]}{0[bsize]}".format(self)
         if self['qd'] is not None:
             res += "_qd" + str(self['qd'])
         if self['thcount'] not in (1, None):
@@ -107,7 +107,7 @@
 
     @property
     def qd(self) -> int:
-        return int(self.vals['iodepth'])
+        return int(self.vals.get('iodepth', '1'))
 
     @property
     def bsize(self) -> int:
@@ -142,6 +142,7 @@
     def params(self) -> JobParams:
         if self._params is None:
             self._params = dict(oper=self.oper,
+                                oper_short=self.op_type_short,
                                 sync_mode=self.sync_mode,
                                 bsize=self.bsize,
                                 qd=self.qd,
@@ -154,7 +155,7 @@
     def __eq__(self, o: object) -> bool:
         if not isinstance(o, FioJobConfig):
             return False
-        return self.vals == cast(FioJobConfig, o).vals
+        return dict(self.vals) == dict(cast(FioJobConfig, o).vals)
 
     def copy(self) -> 'FioJobConfig':
         return copy.deepcopy(self)
diff --git a/wally/suits/io/rpc_plugin.py b/wally/suits/io/rpc_plugin.py
index 5f5cfb5..39ed5cc 100644
--- a/wally/suits/io/rpc_plugin.py
+++ b/wally/suits/io/rpc_plugin.py
@@ -14,9 +14,8 @@
 
 
 # TODO: fix this in case if file is block device
-def check_file_prefilled(path, used_size_mb):
+def check_file_prefilled(path, used_size_mb, blocks_to_check=16):
     used_size = used_size_mb * 1024 ** 2
-    blocks_to_check = 16
 
     try:
         fstats = os.stat(path)
@@ -25,10 +24,8 @@
     except EnvironmentError:
         return False
 
-    offsets = [random.randrange(used_size - 1024) for _ in range(blocks_to_check)]
-    offsets.append(used_size - 1024)
-    offsets.append(0)
-
+    offsets = [0, used_size - 1024] + [random.randrange(used_size - 1024) for _ in range(blocks_to_check)]
+    logger.debug(str(offsets))
     with open(path, 'rb') as fd:
         for offset in offsets:
             fd.seek(offset)
diff --git a/wally/suits/io/verify.cfg b/wally/suits/io/verify.cfg
index 75ab2b4..58a94b0 100644
--- a/wally/suits/io/verify.cfg
+++ b/wally/suits/io/verify.cfg
@@ -1,18 +1,19 @@
 [global]
-include defaults.cfg
-
-size={TEST_FILE_SIZE}
-ramp_time=0
-runtime=15
+include defaults_qd.cfg
+QD={% 1, 2, 4 %}
+runtime=30
+direct=1
 
 # ---------------------------------------------------------------------
-# [verify_{TEST_SUMM}]
-# blocksize=4k
-# rw=randwrite
-# direct=1
 
 [verify_{TEST_SUMM}]
 blocksize=4k
 rw=randwrite
 direct=1
-sync=1
+iodepth={QD}
+
+# [verify_{TEST_SUMM}]
+# blocksize=4k
+# rw=randwr
+# direct=1
+# sync=1