Ceph backup: Improve error message when creating an incremental backup of a non-RBD volume

Bug #1997876 reported by Sofia Enriquez
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Cinder
Triaged
Low
Unassigned

Bug Description

Description:
When trying to create an incremental backup of a non-RBD volume, a very generic and very confusing error message is displayed. It would be nice to improve the description of the error message.

Volume driver: LVM or any
Backup driver: Ceph

Steps:
- Create a LVM volume.
- Create a Ceph backup from that volume.
- Create a incremental backup from that volume

Actual result:
<c-bak logs>
cinder-backup[829242]: ERROR oslo_messaging.rpc.server cinder.exception.BackupRBDOperationFailed: Backup RBD operation failed

Expected result:
Show an error message that only incremental backups of Ceph volumes can be created.

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