NFS Server

[Rick Stevens]

On Fri, 2005-11-11 at 14:36 -0500, Mike Poublon wrote:
> I'm working on setting up an NFS file server using Fedora Core 4. The NFS 
> shares will be accessed by compute nodes inside of a cluster computer. I've 
> successfully done this in the past, but due to some recent hardware changes 
> have run into a slight issue. The server (also head node of the cluster) has 
> Gigabit network cards. 9 of the compute nodes (NFS Clients) do not, they have 
> 10/100 nics. There are also 5 compute nodes that do have gigabit cards. The 
> problem is this:
> 
> When the nodes with gigabit cards mount an NFS share everything works fine. 
> When the 10/100 nodes try to mount, they are successful, but can't read large 
> files (~600mb). They display the error message
> 
> server <hostname> not responding, still trying
> 
> and sit there not realling doing much (as far as i can tell).
> 
> The MTU is set at the default of 1500 on all of the NICS (gigabit and 10/100).
> 
> If anyone has seen this problem and knows a way around it I'd appreciate some 
> hints.

It's not uncommon for autonegotiation to not really work between your
machines and the switch/router.  It would help if we knew what switch
you're using and the makes of the 10/100 cards.

In lieu of that info, see if you can turn off autonegotiation on both
the switch ports connected to the 10/100 machines and the machines
themselves and force 100Mb, full duplex on both ends.  See if that
helps.

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- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
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-               The Theory of Rapitivity: E=MC Hammer                -
-                                  -- Glenn Marcus (via TopFive.com) -
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