Open Stack

Hi,

I am not sure, some body have tested this solution before, But still come
from a background of backup, i strongly believe that for a Software to
understand the difference between incremental and Full it needs to have a
agent at the client side to do a Journalling based on backup objects, I do
not see thai feature is there in Ceph

Regards
Adivya Singh

On Wed, May 17, 2023 at 2:16 PM Rajat Dhasmana <rdhasman at redhat.com> wrote:

> Hi Satish,
>
> Did you check the size of the actual backup file in ceph storage? It
> should be created in the *backups* pool[1].
> Cinder shows the same size of incremental backup as a normal backup but
> file size should be different from
> the size shown in cinder DB records. Also file size of incremental backup
> should not be the same as the file size of full backup.
>
> [1]
> https://github.com/openstack/devstack/blob/34afa91fc9f830fc8e1fdc4d76e7aa6d4248eaaa/lib/cinder_backups/ceph#L22
>
> Thanks
> Rajat Dhasmana
>
> On Wed, May 17, 2023 at 12:25 AM Satish Patel <satish.txt at gmail.com>
> 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.
>>
>>
>>
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