Ubuntu
qemu-kvm package

  1. Bug #712392
  2. Comment #2

Comment 2 for bug 712392

Revision history for this message
Serge Hallyn (serge-hallyn) wrote :

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)?