<div dir="ltr">Folks,<br><div><br></div><div>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. </div><div><br></div><div>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? </div><div><br></div><div>I am running a Yoga release. </div><div><br></div><div><pre style="line-height:16.25px;margin-top:0px;margin-bottom:0px;padding:5px 0px;font-family:"Bitstream Vera Sans Mono",monospace;font-size:13px;color:rgb(0,0,0);background-color:rgb(240,240,240)">$ 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 |
+--------------------------------------+---------------------+-------------+-----------+------+</pre><pre style="line-height:16.25px;margin-top:0px;margin-bottom:0px;padding:5px 0px;font-family:"Bitstream Vera Sans Mono",monospace;font-size:13px;color:rgb(0,0,0);background-color:rgb(240,240,240)"><br></pre><pre style="line-height:16.25px;margin-top:0px;margin-bottom:0px;padding:5px 0px;font-family:"Bitstream Vera Sans Mono",monospace;font-size:13px;color:rgb(0,0,0);background-color:rgb(240,240,240)">My incremental backup still shows 10G size which should be lower compared to the first backup. </pre><pre style="line-height:16.25px;margin-top:0px;margin-bottom:0px;padding:5px 0px;font-family:"Bitstream Vera Sans Mono",monospace;font-size:13px;color:rgb(0,0,0);background-color:rgb(240,240,240)"><br></pre></div></div>