Quoting vitalif(a)yourcmc.ru (vitalif(a)yourcmc.ru):
SSD (block.db) partition contains object metadata in
RocksDB so it probably
loads the metadata before modifying objects (if it's not in cache yet). Also
it sometimes performs compaction which also results in disk reads and
writes. There are other things going on that I'm not completely aware of.
There's the RBD object map... Maybe there are some locks that come into
action when you parallel writes...
There's a config option to enable RocksDB performance counters. You can have
a look into it.
Do you mean more info than:
"rocksdb": {
"rocksdb_write_wal_time": {
"rocksdb_write_memtable_time": {
"rocksdb_write_delay_time": {
"rocksdb_write_pre_and_post_time": {
I see a config option "rocksdb_perf", which is "false" (default
config). Should this be
changed to "true" to enable more RocksDB metrics?
Thanks,
Stefan
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