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

[emmanuel segura]

Colin

Use force_unmount options

2012/5/16 Colin Simpson <Colin.Simpson at iongeo.com>

> 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 at redhat.com
> > https://www.redhat.com/mailman/listinfo/linux-cluster
>
>
> ________________________________
>
>
> This email and any files transmitted with it are confidential and are
> intended solely for the use of the individual or entity to whom they are
> addressed. If you are not the original recipient or the person responsible
> for delivering the email to the intended recipient, be advised that you
> have received this email in error, and that any use, dissemination,
> forwarding, printing, or copying of this email is strictly prohibited. If
> you received this email in error, please immediately notify the sender and
> delete the original.
>
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster
>



-- 
esta es mi vida e me la vivo hasta que dios quiera
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/linux-cluster/attachments/20120517/cb31b9cb/attachment.htm>