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 :)
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