Injection modifies the running state of the specified daemons. It does not modify the central config database (saved / persistent state). Injected values will go away when the daemon restarts.
> On Oct 5, 2022, at 6:10 AM, Nicola Mori <mori@xxxxxxxxxx> wrote:
>
> Dear Ceph users,
>
> I am trying to tune my cluster's recovery and backfill. On the web I found that I can set related tunables by e.g.:
>
> ceph tell osd.* injectargs --osd-recovery-sleep-hdd=0.0 --osd-max-backfills=8 --osd-recovery-max-active=8 --osd-recovery-max-single-start=4
>
> but I cannot find a way to be sure that the settings have been correctly applied and are being honored. Actually, when querying OSD settings I get e.g.:
>
> # ceph config show osd.0 | grep osd_max_backfill
> osd_max_backfills 1000 override
>
> This does not change even if I try to set just a single property for a single osd:
>
> # ceph tell osd.0 injectargs --osd-max-backfills=8
> {}
> osd_max_backfills = '8' osd_recovery_max_active = '1000'
> # ceph config show osd.0 | grep osd_max_backfills
> osd_max_backfills 1000 override
>
> Am I overlooking or doing something wrong?
> Thanks,
>
> Nicola
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