Re: [Ceph-users] Ceph getting slow requests and rw locks

[Phang WM <phang@xxxxxxxxxxxxxxxxxxx>]

Hi,

 After some testing, it looks like when the deep scrubbing is running, the performance is greatly affected. Even when only 1 active deep scrubbing is running.

After some googling, suggestion to enable the kernel CFQ scheduler. 

https://ceph.com/geen-categorie/lowering-ceph-scrub-io-priority/

ceph tell osd.* injectargs '--osd_disk_thread_ioprio_priority 7'
ceph tell osd.* injectargs '--osd_disk_thread_ioprio_class idle'

However on the ceph config documentation http://docs.ceph.com/docs/mimic/rados/configuration/osd-config-ref/

"Since Jewel scrubbing is no longer carried out by the disk iothread, see osd priority options instead "

Does anyone have info on this osd priority setting for Luminous release?

Thanks

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