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In the original backup API design, volume_id is a required field.  In the CLI, volume_id is positional and required as well.  So when I added support to backup from a snapshot, I added snapshot_id as an optional field in the request body of the backup API.  While backup is in process, you cannot delete the volume.  Backup from snapshot and backup from volume are using the same API.  So I think volume status should be changed to “backing-up” to be consistent.  Now I’m thinking the status of the snapshot should be changed to “backing-up” too if snapshot_id is provided.

Thanks,
Xing


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From: 王玺源 [wangxiyuan1007 at gmail.com]
Sent: Thursday, March 2, 2017 10:21 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [cinder] Create backup with snapshots

Hi cinder team:
We met a problem about backup create recently.

The backup can be created from volumes or snapshots. In the both cases, the volume' s status is set to 'backing-up'.

But as I know, when users create backup with snapshots, the volume is not used(Correct me if I'm wrong). So why the volume's status is changed ? Should it keep available? It's a little strange that the volume is "backing-up" but actually only the snapshot is used for backup creation. the volume in "backing-up" means that it can't be used for some other actions. Such as: attach, delete, export to image, extend, create from volume, create backup from volume and so on.

So is there any reason we changed the volume' status here? Or is there any third part driver need the volume's status must be "backing-up" when create backup from snapshots?

Thanks!