In my ceph cluster I am use spinning disks for bluestore OSDs and SSDs just for the block.db.
If I have got it right, right now:
a) only 3,30,300GB can be used on the SSD rocksdb spillover to slow device, so you don't have any benefit with e.g. 250 GB reserved on the SSD for block.db wrt a configuration where only 30 GB on the SSD
b) because of a), the recommendation reported in the doc saying that te block.db size should not be smaller than 4% of block is basically wrong.
Are there plans to change that in next releases ?
I am asking because I am going to buy new hardware and I'd like to understand if I should keep considering this 'constraint' when choosing the size of the SSD disks
Thanks, Massimo
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