>> Could performance of Optane + 4x SSDs per node ever exceed that of >> pure Optane disks? > > No. With Ceph, the results for Optane and just for good server SSDs are > almost the same. One thing is that you can run more OSDs per an Optane > than per a usual SSD. However, the latency you get from both is almost > the same as most of it comes from Ceph itself, not from the underlying > storage. This also results in Optanes being useless for > block.db/block.wal if your SSDs aren't shitty desktop ones. > > And as usual I'm posting the link to my article > https://yourcmc.ru/wiki/Ceph_performance :) You write that they are not reporting QD=1 single-threaded numbers, but in Table 10 and 11 the average latencies are reported which is "close to the same", so they can get Read latency: 0.32ms (thereby 3125 IOPS) Write latency: 1.1ms (therby 909 IOPS) Really nice writeup and very true - should be a must-read for anyone starting out with Ceph. -- Jesper _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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