Red Hat Bugzilla – Bug 676484
There is no indication of full preallocation mode in qemu-img man page
Last modified: 2015-03-04 19:52:37 EST
Description of problem:
Check man page of qemu-img, there is no indication of "full" preallocation mode.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. #man qemu-img , search preallocation mode,get
Preallocation mode (allowed values: off, metadata). An image with preallocated metadata is initially larger but can improve performance when the image needs to grow.
no full mode indicate.
There should be indicated full preallocation mode.
Kevin, it seems like a nice to have
Verified with qemu-kvm-0.12.1.2-2.240.el6.x86_64
Preallocation mode (allowed values: off, metadata, full). An image with preallocated metadata is initially larger but can
improve performance when the image needs to grow. Full preallocation additionally writes zeros to the whole image in order to
preallocate lower layers (e.g. the file system containing the image file) as well. Note that full preallocation writes to
every byte of the virtual disk, so it can take a long time for large images
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No documentation needed
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.