Hello everyone,
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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