Thank you, I will look for cache-tiering so ;) On 08/19/2016 02:50 AM, Christian Balzer wrote: > > Hello, > > completely ignoring your question about primary-affinity (which always > struck me as a corner case thing). ^o^ > > If you're adding SSDs to your cluster you will want to: > > a) use them for OSD journals (if you're not doing so already) > b) create dedicated pools for high speed data (i.e. RBD images for DB > storage) > c) use them for cache-tiering. > > The last one is a much more efficient approach than primary-affinity, > since hot objects will wind up on the SSDs, as opposed to random ones. > > Christian > On Thu, 18 Aug 2016 11:07:50 +0200 Florent B wrote: > >> Hi everyone, >> >> I begin to insert some SSD disks in my Ceph setup. >> >> For now I only have 600GB on SSD (14 000 GB total space). >> >> So my SSDs can't store *each* PG of my setup, for now. >> >> If I set primary-affinity to 0 on non-SSD disks, will I get a problem >> for PGs stored on standard spinning disks ? >> >> For example, a PG is on OSD 4,15,18, if they have primary-affinity to >> 0.00000, will it be a problem to elect a primary ? >> >> Do I have to set primary-affinity to 0.00001 for non-SSD disks ? >> >> Thank you ;) >> >> Flo >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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