[BProc] slow NFS transfers

[Wally E. <Wal...@ut...>]

I am experiencing bad NFS performance on my cluster nodes.  Is this 
common?  Is there a cure?  I have some diskless clustermatic nodes and some 
diskless nodes just PXE booted with Red Hat 8.  The hardware is exactly the 
same.  My non-clustermatic nodes transfer a 350 MB file from an NFS server 
to its /tmp directory in 12.5 seconds.  The clustermatic nodes take about 
31 seconds to transfer the same file from the same server.  I am guessing 
that it has something to do with the options in my fstab file, but I don't 
know much about the noack and nolock options.  Anyone else having this problem?

Here is a sample from my /etc/beowulf/fstab file for the cluster:
172.16.129.1:/exports/home  /home  nfs 
rw,nolock,rsize=8182,wsize=8192,noac 0 0

And a sample from /etc/fstab on a non-clustermatic node with the same hardware:
nfsserver:/exports/home  /home  nfs  bg,soft,intr,rsize=8192,wsize=8192 0 0

Thanks in advance for any help you can offer.

Wally
Wal...@ut...