Re: [BProc] slow NFS transfers

[Joshua A. <lu...@li...>]

On Thu, Sep 11, 2003 at 11:03:04AM -0400, Wally Edmondson wrote:
> 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
> 

Check /proc/sys/net/core/[rmem*,wmem*] and friends on the nodes.  If I
remember correctly the init script for nfs in rh8 fiddles with these for
the better.  Also see http://tldp.org/HOWTO/NFS-HOWTO/performance.html
for some ideas and reccomended values for these settings.

If you haven't used 

Doing this on one system took me from 6MB/s to 70MB/s with a single
server and single client communicating over gigE :).  This required tuning 
on both the client and server settings.

The system that hit 70MB/s on an iozone throughput test had the
following options: rw,rsize=8182,wsize=8192,noac

> 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

Hope this helps,
Josh