On 9 November 2015 at 09:04, Zhenyu Zheng <zhengzhenyul...@gmail.com> wrote:

>  And Nova side also doesn't support detaching root device, that means we
> cannot performing volume backup/restore from cinder side, because those
> actions needs the volume in "available" status.
>
>

It might be of interest to note that volume snapshots have always worked on
attached volumes, and as of liberty, the backup operation now supports a
--force=True option that does a backup of a live volume (via an internal
snapshot, so it should be crash consistent)


-- 
-- 
Duncan Thomas
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