On Thu, 5 Jun 2014, Wido den Hollander wrote:
> On 06/05/2014 08:59 AM, Stuart Longland wrote:
> > Hi all,
> >
> > I'm looking into other ways I can boost the performance of RBD devices
> > on the cluster here and I happened to see these settings:
> >
> > http://ceph.com/docs/next/rbd/rbd-config-ref/
> >
> > A query, is it possible for the cache mentioned there to be paged out to
> > swap residing on a SSD or is it purely RAM-only?
Right now it is RAM only.
> > I see mention of cache-tiers, but these will be at the wrong end of the
> > Ethernet cable for my usage: I want the cache on the Ceph clients
> > themselves not back at the OSDs.
> >
>
> So you want this to serve as a read cache as well?
>
> The librbd cache is mainly used as a write-cache for small writes, it's not
> indented to be a large read cache.
Right. There was a blueprint describing a larger (shared) read cache that
could be stored on a local SSD or file system, but it hasn't moved beyond
the concept stage.
http://wiki.ceph.com/Planning/Sideboard/rbd%3A_shared_read_cache
sage
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