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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 at 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-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.
>
>
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