tree 6f9edab57e14a37dec3b82f8f4e836c521cf24cf
parent 4a83ddb91d144e6bb55e8b4a8ac33e1a8d62d44c
author Michael Polenchuk <mpolenchuk@mirantis.com> 1528543911 +0400
committer Michael Polenchuk <mpolenchuk@mirantis.com> 1528875386 +0400

Handle nova image preallocation mode

Image preallocation allows storage to be fully allocated at instance
start. This should significantly improve performance on writes to new
blocks and may even improve I/O performance to prewritten blocks due
to reduced fragmentation.

Change-Id: Ic285d6bc07dcee65db2dffca9d2730705761121c