Open Stack

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 at 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-detail-detail,list-backups-with-detail-detail#id428
>
> -- 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.