Looks like you’ve considered the essential points for bluestore OSDs, yep. :) My concern would just be the surprisingly-large block.db requirements for rgw workloads that have been brought up. (300+GB per OSD, I think someone saw/worked out?). -Greg
On Tue, Nov 20, 2018 at 1:35 AM Dan van der Ster <d...@vanderster.com> wrote: > Hi ceph-users, > > Most of our servers have 24 hdds plus 4 ssds. > Any experience how these should be configured to get the best rgw > performance? > > We have two options: > 1) All osds the same, with data on the hdd and block.db on a 40GB > ssd partition > 2) Two osd device types: hdd-only for the rgw data pool and > ssd-only for bucket index pool > > But all of the bucket index data is in omap, right? > And all of the omap is stored in the rocks db, right? > > After reading the recent threads about bluefs slow_used_bytes, I had > the thought that as long as we have a large enough block.db, then > slow_used_bytes will be 0 and all of the bucket indexes will be on > ssd-only, regardless of option (1) or (2) above. > > Any thoughts? > > Thanks! > > Dan > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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