[libvirt-users] KVM - full system ( disk+memory) snapshot by excluding the raw disks
Hi There , I have KVM VM with 4 qcow2 disks and 2 raw disks . when I try to take full system snapshot by excluding raw disks . it is give below error . can you help me how to fix this ?. or is it possible to take full system snapshot in this case .?. When I change XMl as internal snapshots for raw disks . It throws a message snapshot are not supported on war disks . [root@localhost oscgpkg-7eee963550ba9e5b]# virsh snapshot-create --domain oscg2 --xmlfile oscgsnapshot.xml error: unsupported configuration: disk 'vda' must use snapshot mode 'internal' [root@localhost oscgpkg-7eee963550ba9e5b]# [root@localhost oscgpkg-7eee963550ba9e5b]# cat oscgsnapshot.xml <domainsnapshot> <description>oscg snapshot</description> <memory snapshot='internal'/> <disks> <disk name='hda' snapshot='internal'> </disk> <disk name='hdb' snapshot='internal'> </disk> <disk name='hdc' snapshot='internal'> </disk> <disk name='hdd' snapshot='internal'> </disk> <disk name='vda' snapshot='no'> </disk> <disk name='vdb' snapshot='no'> </disk> </disks> </domainsnapshot>
On Fri, Mar 15, 2019 at 12:52:06 +0000, Suresh Babu Kandukuru wrote:
Hi There , I have KVM VM with 4 qcow2 disks and 2 raw disks . when I try to take full system snapshot by excluding raw disks . it is give below error . can you help me how to fix this ?. or is it possible to take full system snapshot in this case .?.
No. For internal snapshots the qemu APIs don't support any form of selecting which disks to include in a snapshots and which to omit. This means that for a successful internal snapshot you need all disks to be qcow2.
When I change XMl as internal snapshots for raw disks . It throws a message snapshot are not supported on war disks .
[root@localhost oscgpkg-7eee963550ba9e5b]# virsh snapshot-create --domain oscg2 --xmlfile oscgsnapshot.xml error: unsupported configuration: disk 'vda' must use snapshot mode 'internal'
This error message is based on the inherent limitation of internal snapshots. You can try to use external snapshots where it is possible to snapshot anything (even raw disks, by adding a qcow2 overlay). Unfortunately external snapshots don't work with 'Revert' and 'Delete' snapshot APIs.
participants (2)
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Peter Krempa -
Suresh Babu Kandukuru