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Bluestore/RocksDB will only put the next level up size of DB on flash if the whole size will fit. These sizes are roughly 3GB,30GB,300GB. Anything in-between those sizes are pointless. Only ~3GB of SSD will ever be used out of a 28GB partition. Likewise a 240GB partition is also pointless as only ~30GB will be used. I'm currently running 30GB partitions on my cluster with a mix of 6,8,10TB disks. The 10TB's are about 75% full and use around 14GB, this is on mainly 3x Replica RBD(4MB objects) Nick Can you explain more? You mean that I should increase my 28Gb to 30Gb and this do a trick? How is your db_slow size? We should control it? You control it? How?
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