Hello,
On a Nautilus 14.2.8 cluster I am seeing large RocksDB database with
many slow DB bytes in use.
To investigate this further I marked one OSD as out and waited for the
all the backfilling to complete.
Once the backfilling was completed I exported BlueFS and investigated
the RocksDB using 'ceph-kvstore-tool'. This resulted in 22GB of data.
Listing all the keys in the RocksDB shows me there are 747.000 keys in
the DB. A small portion are osdmaps, but the biggest amount are keys
prefixed with 'b'.
I dumped the stats of the RocksDB and this shows me:
L1: 1/0: 439.32 KB
L2: 1/0: 2.65 MB
L3: 5/0: 14.36 MB
L4: 127/0: 7.22 GB
L5: 217/0: 13.73 GB
Sum: 351/0: 20.98 GB
So there is almost 21GB of data in this RocksDB database. Why? Where is
this coming from?
Throughout this cluster OSDs are suffering from many slow bytes used and
I can't figure out why.
Has anybody seen this or has a clue on what is going on?
I have an external copy of this RocksDB database to do investigations on.
Thank you,
Wido
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