Well this was an interesting journey through the bowels of Ceph. I have
about 6 hours into tweaking every setting imaginable just to circle back to
my basic configuration and 2G memory target per osd. I was never able to
exceed 22 Mib/Sec recovery time during that journey.
I did end up fixing the issue and now I see the following -
io:
recovery: 129 MiB/s, 33 objects/s
This is normal for my measly cluster. I like micro ceph clusters. I have
a lot of them. :)
What was the fix? Adding another disc to the recovery process! I was
recovering to one disc now I'm recovering to two. I have three total that
need to be recovered. Somehow that one disc was completely swamped. I was
unable to see it in htop, atop, iostat. Disc business was 6% max.
My config is back to mclock scheduler, profile high_recovery_ops, and
backfills of 256.
Thank you everyone that took the time to review and contribute. Hopefully
this provides some modern information for the next person that has slow
recovery.
/Chris C
On Fri, May 24, 2024 at 1:43 PM Kai Stian Olstad <ceph+list@xxxxxxxxxx>
wrote:
> On 24.05.2024 21:07, Mazzystr wrote:
> > I did the obnoxious task of updating ceph.conf and restarting all my
> > osds.
> >
> > ceph --admin-daemon /var/run/ceph/ceph-osd.*.asok config get
> > osd_op_queue
> > {
> > "osd_op_queue": "wpq"
> > }
> >
> > I have some spare memory on my target host/osd and increased the target
> > memory of that OSD to 10 Gb and restarted. No effect observed. In
> > fact
> > mem usage on the host is stable so I don't think the change took effect
> > even with updating ceph.conf, restart and a direct asok config set.
> > target
> > memory value is confirmed to be set via asok config get
> >
> > Nothing has helped. I still cannot break the 21 MiB/s barrier.
> >
> > Does anyone have any more ideas?
>
> For recovery you can adjust the following.
>
> osd_max_backfills default is 1, in my system I get the best performance
> with 3 and wpq.
>
> The following I have not adjusted myself, but you can try.
> osd_recovery_max_active is default to 3.
> osd_recovery_op_priority is default to 3, a lower number increases the
> priority for recovery.
>
> All of them can be runtime adjusted.
>
>
> --
> Kai Stian Olstad
>
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