Re: CephFS: caps went stale, renewing

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On Fri, Sep 2, 2016 at 5:58 PM, David <dclistslinux@xxxxxxxxx> wrote:
> Hi All
>
> Kernel client: 4.6.4-1.el7.elrepo.x86_64
> MDS version: 10.2.2
> OS: CentOS 7
>
> I have Cephfs mounted on a few servers, I see the following in the log
> approx every 20 secs on all of them:
>
> kernel: ceph: mds0 caps went stale, renewing
> kernel: ceph: mds0 caps stale
> kernel: ceph: mds0 caps renewed
>
> I'm trying to debug a few intermittent nfs related issues (which may or may
> not be cephfs related) and I'm just wondering if these lines are anything to
> worry about.
>
> I've mounted on a server that is almost completely idle and I'm still seeing
> those lines every 20 secs.

how busy MDS is?  I guess MDS is too busy to response renew cap request?

Regards
Yan, Zheng

>
> Ceph health is OK and the MDS server seems pretty happy although I am
> occasionally seeing some "closing stale session" lines in the ceph-mds log
> but I think that's a separate issue.
>
> Thanks,
> David
>
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