rbd-mirror replay is very slow - but initial bootstrap is fast

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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
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