Red Hat Bugzilla – Bug 746919
Throw an error when 'compression'( -c) and 'preallocation' are used together while using converting images
Last modified: 2013-02-11 17:53:56 EST
Description of problem:
It'd be helpful if an error is thrown on stdout when compression( -c) and preallocation are used *together* while using 'qemu-img' to create either new qcow2 images or converting existing raw to qcow2
Using 'Compression' and 'preallocation' combined is an invalid operation anyway.
Version-Release number of selected component (if applicable):
[root@moon ~]# rpm -q qemu-img
All the time
Steps to Reproduce:
Try to convert (or create a new one) an existing raw -> qcow2 using compression and preallocation as below:
# qemu-img convert -c -f raw -O qcow2 -o preallocation=metadata /var/lib/libvirt/images/honeycomb.dsk /var/lib/libvirt/images/honeycombq.qcow2
Image gets converted just fine. But the disk image doesn't boot successfully into the OS
Throw a meaningful error on the stdout along the lines of: 'using compression and preallocation is invalid' ..
(In reply to comment #0)
> Using 'Compression' and 'preallocation' combined is an invalid operation
Just pre-allocating for metadata but compressing for the rest of the image can be a useful operation, so it's not entirely invalid. However, since that's not done today, throwing an error for now makes sense.
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The process we are following is described here:
With latest qemu git:
# ./qemu-img convert -c -f raw -O qcow2 -o preallocation=metadata foo.raw foo.qcow2
qemu-img: Compression and preallocation not supported at the same time
So just closing as UPSTREAM