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On 4/9/2018 3:51 AM, Gorka Eguileor wrote:
> As I see it, the process would look something like this:
> 
> - Nova detaches volume using OS-Brick
> - Nova calls Cinder re-image passing the node's info (like we do when
>    attaching a new volume)
> - Cinder would:
>    - Ensure only that node is connected to the volume
>    - Terminate connection to the original volume
>    - If we can do optimized volume creation:
>      - If encrypted volume we create a copy of the encryption key on
>        Barbican or copy the ID field from the DB and ensure we don't
>        delete the Barbican key on the delete.
>      - Create new volume from image
>      - Swap DB fields to preserve the UUID
>      - Delete original volume
>    - If it cannot do optimized volume creation:
>      - Initialize+Attach volume to Cinder node
>      - DD the new image into the volume
>      - Detach+Terminate volume
>    - Initialize connection for the new volume to the Nova node
>    - Return connection information to the volume
> - Nova attaches volume with OS-Brick using returned connection
>    information.
> 
> So I agree, it's not a blockRebase operation, just a change in the
> volume that is used.

Yeah we're on the same page with respect to the high level changes on 
the nova side.

-- 

Thanks,

Matt