Re: Impact of a small DB size with Bluestore

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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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