Use force_unmount options
2012/5/16 Colin Simpson <Colin.Simpson@xxxxxxxxxx>
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
>
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