Cache tiering

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On 05/07/2014 02:05 PM, Gandalf Corvotempesta wrote:
> Very simple question: what happen if server bound to the cache pool goes down?
> For example, a read-only cache could be archived by using a single
> server with no redudancy.
> Is ceph smart enough to detect that cache is unavailable and
> transparently redirect all request to the main pool as usual ?
>
> This allow the usage of one very big server as cache-only. No need for
> redundacy.

Not sure about that :)

>
> Second question: how can I set cache pool to be on a defined OSDs list
> and not distributed across all OSDs ? Should I change the crushmap ? I
> would like to set a single server (and all of its OSDs) for the cache
> pool.

Create a ruleset where only that host/OSD is in and change the 
crush_ruleset setting for the cache pool to use that specific ruleset.

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>


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

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


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