Re: 16.2.10: ceph osd perf always shows high latency for a specific OSD

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Anyone, please?

On Thu, 6 Oct 2022 at 14:57, Zakhar Kirpichenko <zakhar@xxxxxxxxx> wrote:

> Hi,
>
> I'm having a peculiar "issue" in my cluster, which I'm not sure whether
> it's real: a particular OSD always shows significant latency in `ceph osd
> perf` report, an order of magnitude higher than any other OSD.
>
> I traced this OSD to a particular drive in a particular host. OSD logs
> don't look any different from any other OSD on the same node, iostat shows
> that the drive is utilized similarly to all other drives, the OSD process
> uses a similar amount of CPU and RAM to other OSD processes. I.e. the OSD
> and its underlying drive look the same as other OSDs and their drives and
> do not appear to have a higher latency on the host's system level.
>
> I am interested to find out what makes this OSD report much higher latency
> and what steps I could take to diagnose and troubleshoot this situation. I
> would appreciate any input and advice.
>
> Best regards,
> Zakhar
>
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