Way to lower latencies while recovering?

[s.priebe@xxxxxxxxxxxx (Stefan Priebe)]

Hello,

while recovering is running my virtual machine latencies using qemu rbd 
goes up from 3-7ms to 250ms-350ms.

So all applications inside vms are slow.

I already have those
      osd_recovery_max_active = 1
      osd_max_backfills = 1
      osd_recovery_op_priority = 5
      osd_recover_clone_overlap = false

Details:
9 Ceph Hosts
each with 4xSSDs

Greets,
Stefan