[Bug 712392] Re: qemu-img convert blocks other tasks

[Serge Hallyn]

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