Den ons 5 feb. 2020 kl 17:27 skrev Vladimir Prokofev <v@prokofev.me>:
Thank you for the insight.
If you're using the default options for rocksdb, then the size of L3 will be 25GB Where this number comes from? Any documentation I can read? I want to have a better understanding on how DB size is calculated.
https://github.com/facebook/rocksdb/wiki/Leveled-Compaction Those pageson the right-side menu have all (and more!) you need to know about rocksdb, which ceph uses.
If you're using the default options for rocksdb, then the size of L3 will be 25GB. Since your block-db is only 20GB and L3 can only be filled if the entire level's size is available, bluefs will begin spillover. Like Igor said, having 30GB+ is recommended if you want to host up to 3 levels of rocksdb in the SSD.
-- May the most significant bit of your life be positive.