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&gt; 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!

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&gt;

I fixed it by calling directly libvirt API! At 2013-06-26 11:31:46,"cmcc.dylan" <dx10years(a)126.com&gt; 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&gt; 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&gt; 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&gt; 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&gt; 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! _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users