[Gluster-users] gluster NFS hang observed mounting or umounting at scale

[Amar Tumballi]

Thanks for the update Erik! Yes, an update on fixed issues really helps
those who have similar issues.

-Amar

On Thu, Feb 13, 2020 at 11:54 PM Erik Jacobson <erik.jacobson at hpe.com>
wrote:

> While it's still early, our testing is showing this issue fixed in
> glusterfs7.2 (we were at 416).
>
> Closing the loop in case people search for this.
>
> Erik
>
> On Sun, Jan 26, 2020 at 12:04:00PM -0600, Erik Jacobson wrote:
> > > One last reply to myself.
> >
> > One of the test cases my test scripts triggered turned out to actually
> > be due to my NFS RW mount options.
> >
> > OLD RW NFS mount options:
> > "rw,noatime,nocto,actimeo=3600,lookupcache=all,nolock,tcp,vers=3"
> >
> > NEW options that work better
> > rw,noatime,nolock,tcp,vers=3"
> >
> > I had copied the RO NFS options we use which try to be aggressive about
> > caching. The RO root image doesn't change much and we want it as fast
> > as possible. The options are not appropriate for RW areas that change.
> > (Even though it's a single image file we care about).
> >
> > So now my test scripts run clean but since what we see on larger systems
> > is right after reboot, the caching shouldn't matter. In the real problem
> > case, the RW stuff is done once after reboot.
> >
> > FWIW I attached my current test scripts, my last batch had some errors.
> >
> > The search continues for the actual problem, which I'm struggling to
> > reproduce @ 366 NFs clients.
> >
> > I believe yesterday, when I posted about actual HANGS, that is the real
> > problem we're tracking. I hit that once in my test scripts - only once.
> > My script was otherwise hitting a "file doesn't really exist even though
> > cached" issue and it was tricking my scripts.
> >
> > In any case, I'm changing the RW NFS options we use regardless.
> >
> > Erik
>
>
>
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