The documentation tell to size the DB to 4% of the disk data ie 240GB for a 6 TB disk. Plz gives more explanations when your answer disagree with the documentation ! Le lun. 25 nov. 2019 à 11:00, Konstantin Shalygin <k0ste@xxxxxxxx> a écrit : > > 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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