Re: NFS synchronization problems on Beowulf cluster

[Trond Myklebust <trond.myklebust@fys.uio.no>]

On Tue, 2006-07-18 at 08:19 -0300, Mario Storti wrote:
> > This is a FAQ that has been well-publicised and discussed to death on
> > this list:
> >   http://nfs.sourceforge.net/#faq_a8
> 
> I tried to mount with `nocto' and `noac' options without success. Also
> tried acregmax=0,acdirmax=0. We are trying to determine if there is
> some mistake in our configuration or if this is a `normal'
> behavior. Your post seems to suggest that this is a `normal' behavior.
> However, previously we had a cluster with RedHat 7.1 (kernel
> 2.2.16-22, NFS version 2) and we didn't had problems like this.  We
> tried to use NFS version 2 on the new cluster and the problem
> persists. So I think that this is problem with the configuration and we
> are still trying to solve the problem tuning the mount/server options.

Please reread the article. This is _normal_ behaviour. NFS has never
been guaranteed to be cache coherent in this way.

NFS checks its data cache on calls to open()/opendir(), and on taking a
lock. That is all.

Cheers,
  Trond


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