[Bug 712392] Re: qemu-img convert blocks other tasks
Serge Hallyn
712392 at bugs.launchpad.net
Thu Feb 3 14:23:11 UTC 2011
Thanks for taking the time to report this bug and helping to make Ubuntu
better.
For my own test on a natty server, I started with a 30G qcow2 disk with
a lucid install on it. It had about 1G allocated. Conversion from
qcow2 to raw took probably less than 10 seconds. Conversion back to
qcow took a lot longer (perhaps a minute). So for a full 40G allocated
drive I certainly would expect it to be slow.
However you certainly do seem to have a real problem there. In your
CurrentDmesg, I see
[257894.409748] Buffer I/O error on device dm-9, logical block 0
[257894.409786] Buffer I/O error on device dm-9, logical block 0
This could indicate a real problem, or just a device which you've since
removed (i.e. usb thumb drive). Could you look under /sys/block/dm-9
for more information?
Can you look for relevant info in /var/log/syslog from this event and
paste them here?
Finally, could you re-test with the qemu-kvm package from the server-
edgers's archive (see https://launchpad.net/~ubuntu-server-
edgers/+archive/server-edgers-qemu-kvm)?
** Changed in: qemu-kvm (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/712392
Title:
qemu-img convert blocks other tasks
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