Re: rbd snapshot slow restore

[Alexandre DERUMIER <aderumier@xxxxxxxxx>]

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De: "Wido den Hollander" <wido@xxxxxxxx>
À: "ceph-users" <ceph-users@xxxxxxxxxxxxxx>
Envoyé: Mardi 16 Décembre 2014 16:18:09
Objet: Re: rbd snapshot slow restore

On 12/16/2014 04:14 PM, Carl-Johan Schenström wrote:
> On 2014-12-16 14:53, Lindsay Mathieson wrote:
>
>>> Is this normal? is ceph just really slow at restoring rbd snapshots,
>>> or have I really borked my setup?
>>
>> I'm not looking for a fix or a tuning suggestions, just feedback on
>> whether
>> this is normal
>
> That is my experience as well. I rolled back a 1,5 TB volume once, and
> had to leave it running overnight before it would complete.
>

That is normal behavior. Snapshotting itself is a fast process, but
restoring means merging and rolling back.

It's easier to protect a snapshot and clone it into a new image and use
that one.

Afterwards you can flatten the image to detach the clone from the
parent. Never tried if this can be done live.

--
Wido den Hollander
42on B.V.
Ceph trainer and consultant

Phone: +31 (0)20 700 9902
Skype: contact42on
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