Red Hat Bugzilla – Bug 465461
Using qcow output format does not work consistently
Last modified: 2009-07-14 12:56:02 EDT
Created attachment 319361 [details]
Kickstart used to reproduce problem
Description of problem:
When running appliance-tools you can specify the output format of the disk image. By default the image is raw. If I try -f qcow the qemu-img process inside appliance-tools fails. qcow2 seems to work fine.
Version-Release number of selected component (if applicable):
Most of the time. It seems to depend on the disk size used in the supplied kickstart. I've been able to get qcow output format to succeed with the following disk layout:
part /boot --ondisk=sda --fstype=ext3 --size=100
part / --ondisk=sda --fstype=ext3 --size=10000
part swap --ondisk=sda --fstype=swap --size=512
But if I toggle the size of / to be anything other than 10000 the qemu-img process fails.
Steps to Reproduce:
1. Download the attached sample.ks kickstart
2. appliance-creator --config sample.ks --name sample -f qcow -d -v
The installation will succeed, but after install when qemu-img is used to convert the disk image from raw to qcow the qemu-img command will fail.
qemu-img should succeed
See attachment for kickstart I used to reproduce this problem.
The following is an example of the error message that is output by the appliance-creator when this fails.
writing image XML to /var/tmp/imgcreate-223Oxs/tmp-N65fLE/foo.xml
converting /var/tmp/imgcreate-223Oxs/tmp-N65fLE/foo-sda.raw image to /var/tmp/imgcreate-223Oxs/tmp-N65fLE/foo-sda.qcow
qemu-img: Could not open '/var/tmp/imgcreate-223Oxs/tmp-N65fLE/foo-sda.qcow'
Unable to convert disk format to qcow, using raw disk image
moving disks to final location
moving /var/tmp/imgcreate-223Oxs/tmp-N65fLE/foo.xml to /var/tmp/imgcreate-223Oxs/out
moving /var/tmp/imgcreate-223Oxs/tmp-N65fLE/foo-sda.raw to /var/tmp/imgcreate-223Oxs/out
moving /var/tmp/imgcreate-223Oxs/tmp-N65fLE/foo-sda.qcow to /var/tmp/imgcreate-223Oxs/out
I did some testing on this issue this morning below are some of my notes...
running with included kickstart file and format set to qcow does reproduce the problem.
running with qcow2 it does not, image creation succeeds. => sample-sda.qcow2 519M
running with format set to raw then succeeds and then manually converting the image with qemu-image, also fails:
# sudo qemu-img convert -f raw sample2-sda.raw -O qcow sample2-sda.qcow
qemu-img: Could not open 'sample2-sda.qcow'
I think it may be a size limitation to qemu-img
looks to be a bug with qemu-img. I have filed a bug on qemu-img 465846
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