Re: [libvirt] domblkstat not working for qemu-kvm > 0.11

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