From: Geoff Lane (zzassgl@zoe.mcc.ac.uk)
Date: Fri Dec 19 2003 - 06:53:08 EST
I've got a network problem that seems intractable.
We have a NFS server (E4500/Solaris 8) connected to ten clients (Netra
X1/Solaris 8) via a Cisco Catalyst 2950 switch. We use Fibre between the
server and the switch (via the GBIC interface) and 100MHz Cat5 between the
switch and the NetraX1s. IPV6 is enabled on all machines, no machine acts as
a router. The switch forms a private network used only for NFS traffic.
All the clients were installed using jumpstart and a common OS image.
This has been working well for about a year.
A few weeks ago we noticed NFS problems on two of the clients. Mounting the
NFS volumes was slow, as was accessing the data on the mounted volumes. On
investigation (with the aid of Sun), nothing could be found wrong with the
client network hardware or software. The problem clients also have
difficulty using the private network to access other clients; we see 90%
packet loss when pinging between a problem client and a working client over
the private network even when it is otherwise idle.
We've power cycled the switch, rebooted the clients and restarted the NFS
daemons on the server with no improvement. We've replaced the Cat5 cables
to the problem clients. We've moved the clients to different switch ports.
The second NIC on each Netra is working without any problems.
Running snoop on the problem client and another system indicates that the
packets do reach the switch. The symptoms suggest that the switch is
dropping about 90% of the packets originating from just two out of 10
clients.
Can anybody suggest anything else to try on Solaris before we try replacing
the switch?
Thanks,
-- /\ Geoff. Lane. /\ Manchester Computing /\ Manchester /\ M13 9PL /\ England /\ "Bother", said Pooh, as the vice squad took his GIFS _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagers
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