I have an Ceph cluster which was designed for file store. Each host have 5 SSDs write intensive of 400GB and 20 HDD of 6TB. So each HDD have a WAL of 5 GB on SSD If i want to put Bluestore on this cluster, i can only allocate ~75GB of WAL and DB on SSD for each HDD which is far below the 4% limit of 240GB (for 6TB) In the doc, i read "It is recommended that the block.db size isn’t smaller than 4% of block. For example, if the block size is 1TB, then block.db shouldn’t be less than 40GB." Are the 4% mandatory ? What should i expect ? Only relative slow performance or problem with such a configuration ?
You should use not more 1Gb for WAL and 30Gb for RocksDB. Numbers ! 3,30,300 (Gb) for block.db is useless.
k
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