[ceph-users] Snaptrim making cluster unusable

Hi all, We are running a small cluster with three nodes and 6-8 OSDs each. The OSDs are SSDs with sizes from 2 to 4 TB. Crush map is configured so all data is replicated to each node. The Ceph version is Ceph 15.2.6. Today I deleted 4 Snapshots of the same two 400GB and 500GB rbd volumes. Shortly after issuing the delete, I noticed the cluster became unresponsive to an extend where almost all our services went down due high IO latency. After a while, I noticed about 20 active snaptrim tasks + another 200 or so snaptrim_wait. I tried setting osd_snap_trim_sleep to 3, osd_pg_max_concurrent_snap_trims to 1 rbd_balance_snap_reads to true, rbd_localize_snap_reads to true Still the only way to make the cluster responsive again was to set osd_pg_max_concurrent_snap_trims to 0 and thus disable snaptrimming. I tried a few other options, but whenever snaptrims are running for a significant number of PGs, the cluster becomes completely unusable. Are there any other options to throttle snaptrimming for that I haven't tried, yet? Thank you, Pascal