I have been thinking about building a hybrid storage pool (inspiration from this article: http://www.root314.com/ceph/2017/04/30/Ceph-hybrid-storage-tiers/). So instead of 3 replicas on SSD I plan to use 2 SSD and the third one will be plain old SATA HDD.
I can easily arrange that primary OSD will be always one of the SSDs so I guess that reading will be fast (high IOps and SSD speed).
But from what I understood so far, during the writing process the client communicates also only with the primary OSDs but it will wait until all data are written on all replicas. This is my main concern. Does this mean that writing speed (and IOps) will be limited by the slowest HDD?
Thanks!
Vaclav M.
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