Thank you Masayuki, Are there any API for ceph which I can use to get real usage from ceph directly related to incremental backup usage? Do I need to configure RGW service to obtain that level of information from ceph using API? On Wed, May 17, 2023 at 10:58 PM Masayuki Igawa <masayuki.igawa@gmail.com> wrote:
Hi Satish,
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?
IIUC, it would be expected behavior. According to the API Doc[1], "size" is "The size of the volume, in gibibytes (GiB)." So, it's not the actual size of the snapshot itself.
What about the "object_count" of "openstack volume backup show" output? The incremental's one should be zero or less than the full backup at least?
[1] https://docs.openstack.org/api-ref/block-storage/v3/?expanded=show-backup-de...
-- Masayuki Igawa
On Wed, May 17, 2023, at 03:51, Satish Patel wrote:
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.