Re: Re: NFS synchronization problems on Beowulf cluster

[Peter Staubach <staubach@redhat.com>]

Mario Storti wrote:

>Mario Storti <mstorti <at> intec.unl.edu.ar> writes:
>
>  
>
>>We have a Beowulf class cluster built on Linux Fedora Core 3 (kernel
>>2.6.15). The cluster is disk-less (nodes don't have hard disks) based
>>on the Warewulf package. NFS traffic is reduced by using VNFS
>>filesystems at the nodes.
>>
>>We found something strange related with NFS. For some files in user
>>accounts if we make some modifications to the file in the server, this
>>changes are not seen in the compute nodes. The NFS server is NFS3 and
>>with the standard configuration (8 instances of the server and default
>>parameters). The cluster has 20 nodes at this time, but we have made
>>experiments with a `cloned' cluster and even with only two nodes the
>>problem persist. 
>>    
>>
>
>I see now that perhaps my reference to VNFS is somewhat obscure. VNFS
>is basically a RAM disk at the nodes (in our case of size 50MB
>approx.) with typically `light' directories /etc, /bin, /lib... 
>
>http://www.warewulf-cluster.org/cgi-bin/trac.cgi/wiki/VNFS
>
>The `heavy' directories like /usr and /home are exported via standard
>NFS, so that the VNFS issue is not directly related with the problem. 
>
>On the other hand we tried to switch to NFS version 2 and the problem 
>persists. 
>

What is the local file system type being exported on the NFS servers?

    Thanx...

       ps


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