Re: CephFS warning: clients laggy due to laggy OSDs

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Hi Janek,

There was some documentation added about it here:
https://docs.ceph.com/en/pacific/cephfs/health-messages/

There is a description of what it means, and it's tied to an mds
configurable.

On Mon, Sep 18, 2023 at 10:51 AM Janek Bevendorff <
janek.bevendorff@xxxxxxxxxxxxx> wrote:

> Hey all,
>
> Since the upgrade to Ceph 16.2.14, I keep seeing the following warning:
>
> 10 client(s) laggy due to laggy OSDs
>
> ceph health detail shows it as:
>
> [WRN] MDS_CLIENTS_LAGGY: 10 client(s) laggy due to laggy OSDs
>      mds.***(mds.3): Client *** is laggy; not evicted because some
> OSD(s) is/are laggy
>      more of this...
>
> When I restart the client(s) or the affected MDS daemons, the message
> goes away and then comes back after a while. ceph osd perf does not list
> any laggy OSDs (a few with 10-60ms ping, but overwhelmingly < 1ms), so
> I'm on a total loss what this even means.
>
> I have never seen this message before nor was I able to find anything
> about it. Do you have any idea what this message actually means and how
> I can get rid of it?
>
> Thanks
> Janek
>
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>


-- 

Laura Flores

She/Her/Hers

Software Engineer, Ceph Storage <https://ceph.io>

Chicago, IL

lflores@xxxxxxx | lflores@xxxxxxxxxx <lflores@xxxxxxxxxx>
M: +17087388804
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