Thank you Sofia, that is quite helpful.
Zitat von Sofia Enriquez senrique@redhat.com:
https://web.archive.org/web/20160404120859/http://gorka.eguileor.com/inside-...
On Tue, May 23, 2023 at 4:39 PM Eugen Block eblock@nde.ag wrote:
I looked through the code with a colleague, apparently the code to increase object counters is not executed with ceph as backend. Is that assumption correct? Would be interesting to know for which backends that would actually increase per backup.
Zitat von Eugen Block eblock@nde.ag:
I see the same for Wallaby, object_count is always 0.
Zitat von Eugen Block eblock@nde.ag:
Hi,
I don't see an object_count > 0 for all incremental backups or the full backup. I tried both with a "full" volume (from image) as well as en empty volume, put a filesystem on it and copied tiny files onto it. This is the result:
controller02:~ # openstack volume backup list
+--------------------------------------+--------------+-------------+-----------+------+
| ID | Name | Description | Status | Size |
+--------------------------------------+--------------+-------------+-----------+------+
| a8a448e7-8bfd-46e3-81bf-3b1d607893e7 | inc-backup2 | None | available | 4 | | 3d11faa0-d67c-432d-afb1-ff44f6a3b4a7 | inc-backup1 | None | available | 4 | | 125c23cd-a5e8-4a7a-b59a-015d0bc5902c | full-backup1 | None | available | 4 |
+--------------------------------------+--------------+-------------+-----------+------+
controller02:~ # for i in `openstack volume backup list -c ID -f value`; do openstack volume backup show $i -c id -c is_incremental -c object_count -f value; done a8a448e7-8bfd-46e3-81bf-3b1d607893e7 True
3d11faa0-d67c-432d-afb1-ff44f6a3b4a7 True
125c23cd-a5e8-4a7a-b59a-015d0bc5902c False
This is still Victoria, though, I think I have a Wallaby test installation, I'll try that as well. In which case should object_count be > 0? All my installations have ceph as storage backend.
Thanks, Eugen
Zitat von Masayuki Igawa masayuki.igawa@gmail.com:
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.
--
Sofía Enriquez
she/her
Software Engineer
Red Hat PnT https://www.redhat.com
IRC: @enriquetaso @RedHat https://twitter.com/redhat Red Hat https://www.linkedin.com/company/red-hat Red Hat https://www.facebook.com/RedHatInc https://www.redhat.com