qcow2 version woes

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Fellow cloudies,

The recent builds of our images are v3 qcow2 (also known as qcow3). This
presents a problem for our testing, since the openstack instances we
have access to don't support v3, only v2. The only difference between v2
and v3 are some performance enhancements - so the question is, should we
produce v2 images instead of v3 for easier testing?

This would require us to request a tweak from releng to get the correct
format, but would stop us from having to use a workaround [0] to test
(and I worry about testing a converted image - because then we rely on
"well, it *should* be the same" for our test results). 

Thoughts?

[0] qemu-img amend -f qcow2 -o compat=0.10 <image.qcow2>

-- 
// Mike 
--
Fedora QA
freenode: roshi
http://roshi.fedorapeople.org
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