[ceph-users] Recovery operations and ioprio options

Nick Fisk nick at fisk.me.uk
Wed Nov 8 13:18:24 PST 2017

> -----Original Message-----
> From: ceph-users [mailto:ceph-users-bounces at lists.ceph.com] On Behalf Of
> ??????? ???????
> Sent: 08 November 2017 16:21
> To: ceph-users at lists.ceph.com
> Subject: [ceph-users] Recovery operations and ioprio options
> Hello,
> Today we use ceph jewel with:
>   osd disk thread ioprio class=idle
>   osd disk thread ioprio priority=7
> and "nodeep-scrub" flag is set.
> We want to change scheduler from CFQ to deadline, so these options will
> lose effect.
> I've tried to find out what operations are performed in "disk thread".
What I
> found is that only scrubbing and snap-trimming operations are performed in
> "disk thread".

In jewel those operations are now in the main OSD thread and setting the
ioprio's will have no effect. Use the scrub and snap trim sleep options to
throttle them.

> Do these options affect recovery operations?
> Are there any other operations in "disk thread", except scrubbing and
> trimming?
> --
> Regards,
> Aleksei Zakharov
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