[Openstack-docs] [openstack/nova] DocImpact review request change I4bbb8616416c9dca3a3a8894ebf764a0b6b8dbc9
gerrit2 at review.openstack.org
gerrit2 at review.openstack.org
Fri Feb 15 20:58:52 UTC 2013
Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/22054
Log:
commit 9ad87143e31911050e75447facb5f8d93f79ae03
Author: Pádraig Brady <pbrady at redhat.com>
Date: Fri Feb 15 18:33:19 2013 +0000
support preallocated VM images
Use fallocate where available to allocate file system blocks efficiently
when the VM is initially provisioned. This will give immediate feedback
if enough space isn't available. Also it should significantly improve
performance and on writes to new blocks, and may even improve I/O
performance to prewritten blocks due to reduced fragmentation.
Also when booting from qcow2 images, we enable the preallocation=metadata
option, which has a small space overhead, but also gives significant
potential performance benefits.
Also noted is the potential to subsume the less general
libvirt_sparse_logical_volumes option into the new more general
use_preallocated_images option.
DocImpact
Implements bp: preallocated-images
Change-Id: I4bbb8616416c9dca3a3a8894ebf764a0b6b8dbc9
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