Open Stack

Folks,

I have ceph storage for my openstack and configure cinder-volume and
cinder-backup service for my disaster solution. I am trying to use the
cinder-backup incremental option to save storage space but somehow It
doesn't work the way it should work.

Whenever I take incremental backup it shows a similar size of original
volume. Technically It should be smaller. Question is does ceph
support incremental backup with cinder?

I am running a Yoga release.

$ openstack volume list
+--------------------------------------+------------+------------+------+-------------------------------------+
| ID                                   | Name       | Status     |
Size | Attached to                         |
+--------------------------------------+------------+------------+------+-------------------------------------+
| 285a49a6-0e03-49e5-abf1-1c1efbfeb5f2 | spatel-vol | backing-up |
10 | Attached to spatel-foo on /dev/sdc  |
+--------------------------------------+------------+------------+------+-------------------------------------+

### Create full backup
$ openstack volume backup create --name spatel-vol-backup spatel-vol --force
+-------+--------------------------------------+
| Field | Value                                |
+-------+--------------------------------------+
| id    | 4351d9d3-85fa-4cd5-b21d-619b3385aefc |
| name  | spatel-vol-backup                    |
+-------+--------------------------------------+

### Create incremental
$ openstack volume backup create --name spatel-vol-backup-1
--incremental --force spatel-vol
+-------+--------------------------------------+
| Field | Value                                |
+-------+--------------------------------------+
| id    | 294b58af-771b-4a9f-bb7b-c37a4f84d678 |
| name  | spatel-vol-backup-1                  |
+-------+--------------------------------------+

$ openstack volume backup list
+--------------------------------------+---------------------+-------------+-----------+------+
| ID                                   | Name                |
Description | Status    | Size |
+--------------------------------------+---------------------+-------------+-----------+------+
| 294b58af-771b-4a9f-bb7b-c37a4f84d678 | spatel-vol-backup-1 | None
    | available |   10 |
| 4351d9d3-85fa-4cd5-b21d-619b3385aefc | spatel-vol-backup   | None
    | available |   10 |
+--------------------------------------+---------------------+-------------+-----------+------+


My incremental backup still shows 10G size which should be lower
compared to the first backup.
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