> Op 4 december 2017 om 13:10 schreef Hans van den Bogert <hansbogert@xxxxxxxxx>:
>
>
> Hi all,
>
> Is there a way to get the current usage of the bluestore's block.db?
> I'd really like to monitor this as we have a relatively high number of
> objects per OSD.
>
Yes, using 'perf dump':
root@bravo:~# ceph daemon osd.1 perf dump|jq '.bluefs'
{
"gift_bytes": 0,
"reclaim_bytes": 0,
"db_total_bytes": 1073741824,
"db_used_bytes": 33554432,
"wal_total_bytes": 0,
"wal_used_bytes": 0,
"slow_total_bytes": 0,
"slow_used_bytes": 0,
"num_files": 9,
"log_bytes": 15745024,
"log_compactions": 0,
"logged_bytes": 6279168,
"files_written_wal": 1,
"files_written_sst": 2,
"bytes_written_wal": 5535337,
"bytes_written_sst": 792836
}
root@bravo:~#
This cluster is just a test (you might remember it ;) ) and not running with any data at the moment.
'db_used_bytes' tells you how many bytes there are in the DB of BlueStore.
> A second question related to the above, are there mechanisms to
> influence which objects' metadata gets spilled once the block.db is
> full? -- For instance, I could not care for the extra latency when
> object metadata gets spilled to the backing disk if it for RGW-related
> data, in contrast to RBD objects metadata, which should remain on the
> faster SSD-based block.db.
>
Not that I'm aware of.
Wido
> Regards,
>
> Hans
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