In certain cases (Luminous) it can actually be faster to destroy an OSD and 
recreate it than to let it backfill huge maps, but I think that’s been improved 
 by Nautilus.

You might also try setting

osd_op_queue_cut_off = high

to reduce the impact of recovery on client operations.  This became the default 
setting at Octopus; yours is likely set to low.



> I did the same but it moved 200K keys/s!
> 
> On Wed, Dec 2, 2020 at 5:14 PM Stefan Kooman <ste...@bit.nl> wrote:
> 
>> On 12/1/20 12:37 AM, Seena Fallah wrote:
>>> Hi all,
>>> 
>>> Is there any configuration to slow down keys/s in recovery mode?
>> 
>> Not just keys, but you can limit recovery / backfill like this:
>> 
>> ceph tell 'osd.*' injectargs '--osd_max_backfills 1'
>> ceph tell 'osd.*' injectargs '--osd_recovery_max_active 1'
>> 
>> Gr. Stefan
>> 
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