That PDF specifically calls for P3700 NVMe SSDs, not the consumer 750. You need high endurance drives usually.
I’m using 1x400GB Intel P3700 per 9 OSDs (so 4xP3700 per 36 disk chassis). > On 11 Feb 2016, at 17:56, Michael <mabarkd...@gmail.com> wrote: > > Alex Leake <A.M.D.Leake@...> writes: > >> >> Hello Michael, >> >> I maintain a small Ceph cluster at the University of Bath, our cluster > consists of: >> >> Monitors: >> 3 x Dell PowerEdge R630 >> >> - 2x Intel(R) Xeon(R) CPU E5-2609 v3 >> - 64GB RAM >> - 4x 300GB SAS (RAID 10) >> >> OSD Nodes: >> 6 x Dell PowerEdge R730XD & MD1400 Shelves >> >> - 2x Intel(R) Xeon(R) CPU E5-2650 >> - 128GB RAM >> - 2x 600GB SAS (OS - RAID1) >> - 2x 200GB SSD (PERC H730) >> - 14x 6TB NL-SAS (PERC H730) >> - 12x 4TB NL-SAS (PERC H830 - MD1400) >> >> Please let me know if you want any more info. >> >> In my experience thus far, I've found this ratio is not useful for cache > tiering etc - the SSDs are in a >> separate pool. >> >> If I could start over, I'd go for fewer OSDs / host - and no SSDs (or a > much better ratio - like 4:1). >> >> Kind Regards, >> Alex. >> _______________________________________________ >> ceph-users mailing list >> ceph-users <at> lists.ceph.com <http://lists.ceph.com/> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com> >> > > I'm really glad you noted this, I was just following Redhat/SuperMicro > deployment reference architecture > (https://www.redhat.com/en/files/resources/en-rhst-cephstorage-supermicro- > <https://www.redhat.com/en/files/resources/en-rhst-cephstorage-supermicro-> > INC0270868_v2_0715.pdf) page 11 noted 12 disks per 7xx intel ssd. So I was > debating if it might have been suitable. I try and have only 4 spinning > disks per SSD cache. > > If I get 4TB NL-SAS drives, how big would the SSD need to be? > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com>
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