4:30 p.m.
I fixed it by calling directly libvirt API!
At 2013-06-26 11:31:46,"cmcc.dylan" <dx10years(a)126.com> wrote:
Thank you!
But snapshot-create-as will traverse all disks of the virtual machine and create snapshots
for all of them. In my case, I want to create snapshot for root disk.
What's more. I understand "--diskspec" is a description of the disk. Do you
mean it's used to specify a single disk to snapshot.
在 2013-06-26 09:10:31，"Gao Yongwei" <itxx00(a)gmail.com> 写道：
try snapshot-create-as like below:
virsh snapshot-create-as vm --disk-only --diskspec "vda,snapshot=external"
2013/6/25 cmcc.dylan <dx10years(a)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(a)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(a)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@redhat.com [mailto:libvirt-users-bounces@redhat.com] On Behalf
Of cmcc.dylan
Sent: Saturday, June 22, 2013 11:13 AM
To:libvirt-users@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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