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Re: [Linux-cluster] RHEL/CentOS-6 HA NFS Configuration Question



This is interesting.

We very often see the filesystems fail to umount on busy clustered NFS
servers.

What is the nature of the "real fix"?

I like the idea of NFSD fully being in user space, so killing it would
definitely free the fs.

Alan Brown (who's on this list) recently posted to a RH BZ that he was
one of the people who moved it into kernel space for performance reasons
in the past (that are no longer relevant):

https://bugzilla.redhat.com/show_bug.cgi?id=580863#c9

, but I doubt this is the fix you have in mind.

Colin

On Tue, 2012-05-15 at 20:21 +0200, Fabio M. Di Nitto wrote:
> This solves different issues at startup, relocation and recovery
>
> Also note that there is known limitation in nfsd (both rhel5/6) that
> could cause some problems in some conditions in your current
> configuration. A permanent fix is being worked on atm.
>
> Without extreme details, you might have 2 of those services running on
> the same node and attempting to relocate one of them can fail because
> the fs cannot be unmounted. This is due to nfsd holding a lock (at
> kernel level) to the FS. Changing config to the suggested one, mask the
> problem pretty well, but more testing for a real fix is in progress.
>
> Fabio
>
> --
> Linux-cluster mailing list
> Linux-cluster redhat com
> https://www.redhat.com/mailman/listinfo/linux-cluster


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