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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): qemu-kvm-0.12.1.2-2.144.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. #man qemu-img , search preallocation mode,get "preallocation" Preallocation mode (allowed values: off, metadata). An image with preallocated metadata is initially larger but can improve performance when the image needs to grow. Actual results: no full mode indicate. Expected results: There should be indicated full preallocation mode. Additional info:
Kevin, it seems like a nice to have
Verified with qemu-kvm-0.12.1.2-2.240.el6.x86_64 "preallocation" 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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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. http://rhn.redhat.com/errata/RHBA-2012-0746.html