> Op 3 januari 2017 om 2:49 schreef Mike Miller <millermike287@xxxxxxxxx>: > > > will metadata on SSD improve latency significantly? > No, as I said in my previous e-mail, recent benchmarks showed that storing CephFS metadata on SSD does not improve performance. It still might be good to do since it's not that much data thus recovery will go quickly, but don't expect a CephFS performance improvement. Wido > Mike > > On 1/2/17 11:50 AM, Wido den Hollander wrote: > > > >> Op 2 januari 2017 om 10:33 schreef Shinobu Kinjo <skinjo@xxxxxxxxxx>: > >> > >> > >> I've never done migration of cephfs_metadata from spindle disks to > >> ssds. But logically you could achieve this through 2 phases. > >> > >> #1 Configure CRUSH rule including spindle disks and ssds > >> #2 Configure CRUSH rule for just pointing to ssds > >> * This would cause massive data shuffling. > > > > Not really, usually the CephFS metadata isn't that much data. > > > > Recent benchmarks (can't find them now) show that storing CephFS metadata on SSD doesn't really improve performance though. > > > > Wido > > > >> > >> > >> On Mon, Jan 2, 2017 at 2:36 PM, Mike Miller <millermike287@xxxxxxxxx> wrote: > >>> Hi, > >>> > >>> Happy New Year! > >>> > >>> Can anyone point me to specific walkthrough / howto instructions how to move > >>> cephfs metadata to SSD in a running cluster? > >>> > >>> How is crush to be modified step by step such that the metadata migrate to > >>> SSD? > >>> > >>> Thanks and regards, > >>> > >>> Mike > >>> _______________________________________________ > >>> 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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