[libvirt] Get disk size for disk type="network"

[Qiang Fu]

Hi Eric,

Thanks for your reply.

In this case the openstack is integrated with ceph and the volume in ceph
is attached to the VMs in openstack. The VM is able to access the volume
using the authentication included in the disk section. So there will not be
any pool on the KVM side.

I tried 'virsh domblkinfo $dom vda' but it does not work because it failed
to stat the volume path as it appears in the source name (
svl-cc1-cinder-volume-1/volume-0a4cdeab-863d-4394-845f-008b993bc4e9).
However 'virsh domblkstat $dom vda' still works and I am able to get the
disk R/W information.

I am wondering if I need to format the volume path to include the protocol
(rbd) and the ceph authentication in order to let libvirt be able to talk
with the ceph to get the block information. I am still trying that. Can you
please provide any comment on this?

Thanks,
Bruce


On Tue, Mar 11, 2014 at 9:59 AM, Eric Blake <eblake at redhat.com> wrote:

> On 03/10/2014 07:09 PM, Qiang Fu wrote:
> > Hi,
> >
> > In the output of "virsh dumpxml" command the disk section is as follows:
> >
> > <disk type='network' device='disk'>
> >       <driver name='qemu' type='raw' cache='writeback'/>
> >       <auth username='svl-cc1-cinder-user'>
> >         <secret type='ceph' uuid='e80afa94-a64c-486c-9e34-d55e85f26406'/>
> >       </auth>
> >       <source protocol='rbd'
> >
> name='svl-cc1-cinder-volume-1/volume-0a4cdeab-863d-4394-845f-008b993bc4e9'>
> >         <host name='10.34.114.211' port='6789'/>
> >         <host name='10.34.114.212' port='6789'/>
> >         <host name='10.34.114.213' port='6789'/>
> >       </source>
> >       <target dev='vda' bus='virtio'/>
> >       <serial>0a4cdeab-863d-4394-845f-008b993bc4e9</serial>
> >       <alias name='virtio-disk0'/>
> >       <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
> > function='0x0'/>
> >     </disk>
> >
> > In this case how can I use libvirt to get the disk/volume size
> information?
>
> Have you tried 'virsh vol-dumpxml $vol', for an appropriate choice of
> $vol?  It may require creating an rbd storage pool first.
>
> There's also 'virsh domblkinfo $dom vda', for obtaining information
> about the vda disk associated with $dom.
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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