As mentioned here recently, the sizing recommendations for BlueStore
have been updated:
http://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/#sizing
In our ceph cluster, we have some ratios that are much lower, like 20GB
of SSD (WAL and DB) per 7TB of spinning space. This stems from the fact
that it started much earlier, with sizing done with filestore based OSDs
in mind (SSDs for journals), that were converted to BlueStore later.
So SSD space is much lower than recommended, but much higher than needed
for WAL only. Would it still be better to remove the DB from SSD? Or
what problems could arise with our current setup? Up to now (several
months), we do not see any disadvantages.
Harry
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