Yes, I was in a similar situation initially where I had deployed my OSD's with
25GB DB partitions and after 3GB DB used, everything else was going into slowDB
on disk. From memory 29GB was just enough to make the DB fit on flash, but 30GB
is a safe round figure to aim for. With a 30GB DB partition with most RBD type
workloads all data should reside on flash even for fairly large disks running
erasure coding.
Nick
Nick, thank you! After upgrading to 12.2.11 I was expand blockDB and for
a week after compaction slowDB is not used [1].
{
"gift_bytes": 0,
"reclaim_bytes": 0,
"db_total_bytes": 32212897792,
"db_used_bytes": 6572474368,
"wal_total_bytes": 1074589696,
"wal_used_bytes": 528482304,
"slow_total_bytes": 240043163648,
"slow_used_bytes": 0,
"num_files": 113,
"log_bytes": 8683520,
"log_compactions": 3,
"logged_bytes": 203821056,
"files_written_wal": 2,
"files_written_sst": 1138,
"bytes_written_wal": 121626085396,
"bytes_written_sst": 47053353874
}
I also writed how-to increase partition size for my case, will maybe
useful for someone [2].
[1] https://ibb.co/tXGqbbt
[2] https://bit.ly/2UFVO9Z
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