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Hi, thanks all for replying, sorry I might be a bit unclear.

We have user demands that we only change the root device of an
volume-backed instance for upper layer services. It's not cloudy but it is
quite common. And changing OS is another demand that sort of related to
this.

Cinder supports live-backup volume, but not support live-restore a volume.

Are we planning to support this kind of action?

Yours,
Zheng

On Mon, Nov 9, 2015 at 8:24 PM, Duncan Thomas <duncan.thomas at gmail.com>
wrote:

> On 9 November 2015 at 09:04, Zhenyu Zheng <zhengzhenyulixi at 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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