Cinder backup does not cleanup ceph rbd volume snapshot

Solution Verified - Updated -

Environment

  • Red Hat OpenStack Platform 16.1, 16.2
  • Red Hat Ceph Storage 4

Issue

Snapshots from volume backups created by Cinder are never removed, even if the backup is removed and increases backups occupation.

Resolution

To save space, a manual delete can be done with rbd commands. The workaround is to list the snapshots and delete the ones is not needed.

  1. List all images of a volume:
rbd du -p {pool-name} {image-name}
  1. Remove a snapshot of a volume (if needed execute for more snapshots):
rbd snap rm {pool-name}/{image-name}@{snap-name}

Root Cause

It is being investigated in Bugzilla Bug 2120749.

Diagnostic Steps

  1. Create a volume.
$ openstack volume create  --size 10 test01
  1. Create a backup of the volume.
$ openstack volume backup create test01
  1. Remove the backup.
$ openstack volume backup delete bd86b8c6-ba93-4a3f-ab84-b4954fa46d2f
  1. List the volumes or snapshots and should exist a snapshot of the backup (rbd du, rbd snap ls).
# rbd du -p volumes volume-03ccce5c-0572-4855-9bab-0bb706d2793f
NAME                                                                                                            PROVISIONED USED 
volume-03ccce5c-0572-4855-9bab-0bb706d2793f@backup.bd86b8c6-ba93-4a3f-ab84-b4954fa46d2f.snap.1661271680.6115808      10 GiB  0 B 
volume-03ccce5c-0572-4855-9bab-0bb706d2793f                                                                          10 GiB  0 B 
<TOTAL>                                                                                                              10 GiB  0 B

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