Hi Zakhar,
you might want to try offline DB compaction using ceph-kvstore-tool for
this specific OSD.
Periodically we observe OSD perf drop due to degraded RocksDB
performance, particularly after bulk data removal/migration.. Compaction
is quite helpful in this case.
Thanks,
Igor
On 26/04/2023 20:22, Zakhar Kirpichenko wrote:
Hi,
I have a Ceph 16.2.12 cluster with uniform hardware, same drive make/model,
etc. A particular OSD is showing higher latency than usual in `ceph osd
perf`, usually mid to high tens of milliseconds while other OSDs show low
single digits, although its drive's I/O stats don't look different from
those of other drives. The workload is mainly random 4K reads and writes,
the cluster is being used as Openstack VM storage.
Is there a way to trace, which particular PG, pool and disk image or object
cause this OSD's excessive latency? Is there a way to tell Ceph to
I would appreciate any advice or pointers.
Best regards,
Zakhar
_______________________________________________
ceph-users mailing list -- ceph-users@xxxxxxx
To unsubscribe send an email to ceph-users-leave@xxxxxxx
_______________________________________________
ceph-users mailing list -- ceph-users@xxxxxxx
To unsubscribe send an email to ceph-users-leave@xxxxxxx
