[libvirt] domblkstat not working for qemu-kvm > 0.11
Hi, with all qemu-kvm > 0.11, virsh domblkstat is not working: virsh -c qemu://node03/system domblkstat wp01 vdb : invalid argument in no stats found for device virtio-disk1 (vda, vdb etc. works with 0.11) "virtio-disk1" seems to be a red herring: virsh -c qemu://node03/system domblkstat wp01 virtio-disk1 : invalid argument in invalid path: virtio-disk1 Most probably there have been made some changes with 0.12 libvirt does not resemble yet. If you need more debugging output, just tell. kr,t
On Tue, Feb 09, 2010 at 04:06:56PM +0100, Thomas Treutner wrote:
Hi,
with all qemu-kvm > 0.11, virsh domblkstat is not working:
virsh -c qemu://node03/system domblkstat wp01 vdb : invalid argument in no stats found for device virtio-disk1
(vda, vdb etc. works with 0.11)
"virtio-disk1" seems to be a red herring:
virsh -c qemu://node03/system domblkstat wp01 virtio-disk1 : invalid argument in invalid path: virtio-disk1
Most probably there have been made some changes with 0.12 libvirt does not resemble yet. If you need more debugging output, just tell.
I've managed to reproduce it and figured out what's wrong. libvirt was trying to match against the device name 'virtio-disk1' rather than against the drive name 'drive-virtio-disk1' and so not finding the stats. The reason its matching 'virtio-disk1' rather than 'vda' is that that is the globally unique name libvirt gave to the 'vda' device. You can see this now in the XML format <alias> element. In the future we will allow you to actually pass the alias in directly, as an alternative to the 'vda' style name Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
On Wed, Feb 10, 2010 at 04:58:25PM +0000, Daniel P. Berrange wrote:
On Tue, Feb 09, 2010 at 04:06:56PM +0100, Thomas Treutner wrote:
Hi,
with all qemu-kvm > 0.11, virsh domblkstat is not working:
virsh -c qemu://node03/system domblkstat wp01 vdb : invalid argument in no stats found for device virtio-disk1
(vda, vdb etc. works with 0.11)
"virtio-disk1" seems to be a red herring:
virsh -c qemu://node03/system domblkstat wp01 virtio-disk1 : invalid argument in invalid path: virtio-disk1
Most probably there have been made some changes with 0.12 libvirt does not resemble yet. If you need more debugging output, just tell.
I've managed to reproduce it and figured out what's wrong. libvirt was trying to match against the device name 'virtio-disk1' rather than against the drive name 'drive-virtio-disk1' and so not finding the stats.
The reason its matching 'virtio-disk1' rather than 'vda' is that that is the globally unique name libvirt gave to the 'vda' device. You can see this now in the XML format <alias> element. In the future we will allow you to actually pass the alias in directly, as an alternative to the 'vda' style name
FYI, I've added a test case for the disk stats API now & just posted the fix to the list http://libvirt.org/git/?p=libvirt-tck.git;a=blob;f=scripts/domain/120-disks-... Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
participants (2)
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Daniel P. Berrange -
Thomas Treutner