Source:Troubleshooting KVM QEMU

KVM/QEMU

Merging and deleting leftover snapshots

Problem

• The backup fails and the snapshot is left behind.

⇒ Solution

Use the virsh utility, as shown in the example:

1. List the available snapshots for the domain:

 user@hypervisor:~$ virsh snapshot-list <domain_name>
 Name                 Creation Time             State
 ------------------------------------------------------------
 Sesam_SF20173828282@XXXX      2017-07-06 08:15:11 +0200 disk-snapshot

In this example, one leftover snapshot for this VM exists.

2. List the virtual disks for the domain:

 user@hypervisor:~$ virsh domblklist <domain_name>
 Target     Source
 ------------------------------------------------
 sda        /path/to//Sesam_SF20173828282@XXXX.snapshot

3. For each device that refers to SEP sesam snapshot, start a block commit to merge the snapshot:

 user@hypervisor:~$ virsh blockcommit <domain_name> sda --active --verbose --pivot
 Block Commit: [100 %]
 Successfully pivoted

4. Confirm that the device is now switched to the original disk device:

 user@hypervisor:~$ virsh domblklist <domain_name>
 Target     Source
 ------------------------------------------------
 sda        /my/original/base.img

5. Delete the snapshot metadata information:

 user@hypervisor:~$ virsh snapshot-delete <domain_name> --metadata --snapshotname Sesam_SF20173828282@XXXX
 Domain snapshot sesam_snapshot deleted

6. Delete the snapshot file:

 user@hypervisor:~$ rm /path/to//Sesam_SF20173828282@XXXX.snapshot

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