[ceph-users] rbd-mirror replay is very slow - but initial bootstrap is fast

Hello List, when i initially enable journal/mirror on an image it gets bootstrapped to my site-b pretty quickly with 250MB/sec which is about the IO Write limit. Once its up2date, the replay is very slow. About 15KB/sec and the entries_behind_maste is just running away: root@ceph01:~# rbd --cluster backup mirror pool status rbd-cluster6 --verbose health: OK images: 3 total 3 replaying ... vm-112-disk-0: global_id: 60a795c3-9f5d-4be3-b9bd-3df971e531fa state: up+replaying description: replaying, master_position=[object_number=623, tag_tid=3, entry_tid=345567], mirror_position=[object_number=35, tag_tid=3, entry_tid=18371], entries_behind_master=327196 last_update: 2020-03-10 11:36:44 ... Write traffic on the source is about 20/25MB/sec. On the Source i run 14.2.6 and on the destination 12.2.13. Any idea why the replaying is sooo slow? Thanks, Michael