Rick Stevens wrote:
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.
I'm using Intel Pro 100 cards (drivermodule e100) and the switch is a
Netgear GS524.
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.
I'd prefer not to switch everything back to 100Mb if I don't have to.
The reason this came up is because
of a recent upgrade to the gigabit switch (it was a 10/100 switch
before). The thought was that having a gigabit
path to the server would help out on performance.
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- Rick Stevens, Senior Systems Engineer rstevens@xxxxxxxxxxxxxxx -
- 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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