Ceph random high latency

same issue here. only two node OSDs under constant high latency out of 7 nodes. Other OSD most of the time latency 0.
 
we solved our issue by enabling

bluestore_allocator = bitmap

this fixed a bug in the CEPH version used on proxmox, google for

ceph proxmox bitmap allocator

to find more info (im not allowed to post links here)
 
to find out if you have the same bug, restart the osd's which have a high latency and observe if it starts with low latency again. if not your problem is somewhere else (HBA, disks, cable ...)