Open Stack

Hi Manoj,

Snapshot attachment is a feature used to create backups from a snapshot
efficiently if the driver supports it.
This functionality is not exposed to users and is an optimization rather
than a feature that a backend supports.
See patch[1] which corrects its description in the support matrix.

[1] https://review.opendev.org/c/openstack/cinder/+/800015

On Mon, Aug 9, 2021 at 2:55 PM Katari Kumar <katkumar at in.ibm.com> wrote:

> Hi everyone,
>
> Is snapshot attachment supported by openstack ? does it really look for
> the sanpshot table when we perform attachemnt with snapshot id?
> i see this error below
>  stack at altranvm4:~$ cinder list
>
>  +--------------------------------------+-----------+--------------------------+------+-----------------+----------+-------------+
> | ID                                   | Status    | Name
>     | Size | Volume Type     | Bootable | Attached to |
>
>  +--------------------------------------+-----------+--------------------------+------+-----------------+----------+-------------+
> | 418f5dd9-bed9-4a04-abf4-26cae153beb7 | available | non-rep-vol1
>     | 1    | vol_type_auto_0 | false    |             |
> | e646f5ca-071d-4e3d-b8a9-844301e703a5 | available |
> clone_non_rep_vol_auto_0 | 1    | vol_type_auto_1 | false    |             |
>
>  +--------------------------------------+-----------+--------------------------+------+-----------------+----------+-------------+
> stack at altranvm4:~$ cinder snapshot-list
>
> +--------------------------------------+--------------------------------------+-----------+-----------+------+----------------------------------+
> | ID                                   | Volume ID
>    | Status    | Name      | Size | User ID                          |
>
> +--------------------------------------+--------------------------------------+-----------+-----------+------+----------------------------------+
> | e229406e-3b93-4c4c-aabb-43e017bd0c1a |
> 418f5dd9-bed9-4a04-abf4-26cae153beb7 | available | snap-vol1 | 1    |
> 2f9f21f8794d430fb7d425cf7243c22a |
>
> +--------------------------------------+--------------------------------------+-----------+-----------+------+----------------------------------+
> stack at altranvm4:~$ openstack server list
>
> +--------------------------------------+-------------+--------+------------------------+--------------------------+-----------+
> | ID                                   | Name        | Status | Networks
>             | Image                    | Flavor    |
>
> +--------------------------------------+-------------+--------+------------------------+--------------------------+-----------+
> | 46958490-f41f-4a98-9a7a-ae1f93b8b73e | host_auto_0 | ACTIVE |
> shared=192.168.233.6   | cirros-0.5.2-x86_64-disk | cirros256 |
> | 3026096b-efb4-4dd5-a73b-804d87c1ca1e | testhost1   | ACTIVE |
> shared=192.168.233.138 | cirros-0.5.2-x86_64-disk | cirros256 |
>
> +--------------------------------------+-------------+--------+------------------------+--------------------------+-----------+
>
> * stack at altranvm4:~$ openstack server add volume
> 3026096b-efb4-4dd5-a73b-804d87c1ca1e
> e229406e-3b93-4c4c-aabb-43e017bd0c1a No volume with a name or ID of
> 'e229406e-3b93-4c4c-aabb-43e017bd0c1a' exists.*
>
>  it is looking for the id in the volume table , where as the id given is a
> snapshot
>  Cinder support matrix (
> https://docs.openstack.org/cinder/latest/reference/support-matrix.html)
> says many drivers are supporting snapshot attachment. i wonder how ?
>  Even the '#cinder attachment-create' gives the same error if snapshot is
> used for attachment.
>
> BR,
> Manoj Katari
>
>
>
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