[libvirt-users] snapshot-create-as for a single disk not all disks

[Gao Yongwei]

try snapshot-create-as like below:
virsh snapshot-create-as vm --disk-only --diskspec "vda,snapshot=external"


2013/6/25 cmcc.dylan <dx10years at 126.com>

>
> Hi, everyone,
>    I have found the API snapshotCreateXML() can create a snapshot for a
> virtual machine, and the xml configuration file - snapshot.xml as folllows:
> <domainsnapshot>
>   <name>snapshot01</name>
>   <description>Snapshot of OS install and updates</description>
>   <disks>
>      <disk name='vda' snapshot='external'>
>      <source file='/data10/snapshot'/>
>      </disk>
>      </disks>
> </domainsnapshot>
>
> How can I use the API or could I use "snapshot-create" ?
> I try "virsh snapshot-create domain_name snapshot.xml", but I report an
> error: error: unsupported configuration: disk 'vda' must use snapshot
> mode 'internal'.
> What's the probem? I feel crazy now.
> Could someone give me a sucessfule example?
>
>
>
>
>
> At 2013-06-25 16:46:32,"cmcc.dylan" <dx10years at 126.com> wrote:
>
> Thanks for you reply!
>     Firstly, I'm very sorry I forgot introduce the scenarios in my
> experiments. Supposing a case, I have a virtual machine with two disks. One
> is mounted as a root partition and the other is data partition and the
> second disk is an iscsi lun, that is to say, not a local disk or image. Now
> the result wanted is that creating a snapshot for the root disk but not for
> the data disk when executing "virsh snapshot-create-as" command. Actually,
> it meet an error:
>       error:unsuported configuration: source for disk 'vdc' is not a
> regular file; refusing to generate external snapshot name.
>     The xml configuration of this virtual machine as follows:
>          <disk type='block' device='disk'>
>               <driver name='qemu' type='raw' />
>              <source dev='/dev/sdm1' >                 // sdm1 is a remote
> scsi lun and mounted at the local host
>               <target dev='vdc' bus='virtio' />
>          </disk>
>      Given above problem, I want to only create the snapshot of local disk.
>
>
>
> 在 2013-06-24 23:22:47，"vonNieda, Adam (USMS)" <Adam.vonNieda at usdoj.gov>
> 写道：
>
>  ** **
>
>    I think what you’re looking for is LVM snapshots. The whole purpose of
> taking VM snapshots is to have a consistent image of the machine as a
> whole. There’s lots of articles out there on LVM snapshots, here’s one. **
> **
>
> ** **
>
>    http://www.tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html****
>
> ** **
>
> *From:* libvirt-users-bounces at redhat.com [mailto:
> libvirt-users-bounces at redhat.com] *On Behalf Of *cmcc.dylan
> *Sent:* Saturday, June 22, 2013 11:13 AM
> *To:* libvirt-users at redhat.com
> *Subject:* [libvirt-users] snapshot-create-as for a single disk not all
> disks****
>
> ** **
>
> Hi everyone!****
>
>    Is there any way to create snaphot for a single disk of a virtual
> machine. As I konw, "virsh snapshot-create-as domain_name  snapshot_name
> --disk-only" traverses all block devices to create snapshot. However I
> don't want to create snapshot except for root partition.****
>
>   The version of qemu and libvirt I used is as follows:****
>
>                 qemu-1.4.2 and libvrit-0.10.2****
>
>   I meet an error when I delete the snapshot which is created by
> "snapshot-create-as" command. whether or not qemu(1.4.2) and
> libvirt(0.10.2) don't support the function currently.****
>
> ** **
>
>    Look forward to your help!****
>
> ** **
>
>
>
>
>
>
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