samba - Aug 2004 - Losing network connection

Can anyone give me any ideas on how to debug a problem we're having with
our Samba system (running SUSE SLES7 with Samba 3.0.4).

We occasionally receive a message concerning a dropped network connection
in our messages file:
Aug 12 14:46:23 ismlnx1 kernel: lcs problems detected eth0 temporarily
unavailable.

Telnet/SSH access is gone, as are all Samba connections (actually they are
there until they time out), and then we need to reboot in order to get our
connections back.

I haven't increased my debug level yet in smb.conf but that's probably
what
I'm going to try next.

And this seems to happen when a user attempts to copy a large number of
files to the share using xcopy, but we haven't confirmed this yet.

Thanks.

Brian Tidlund
Strategic Software Consultant
Host Software Services, ISM Canada
One Research Drive, Regina Saskatchewan, Canada S4S 7H1
Tel: (306) 790-5137  Fax: (306) 790-5070  btidlund@ca.ibm.com
IBM Global Services

> Aug 12 14:46:23 ismlnx1 kernel: lcs problems detected eth0 temporarily
> unavailable.
> 
> Telnet/SSH access is gone, as are all Samba connections (actually they are
> there until they time out), and then we need to reboot in order to get our
> connections back.
> 
> I haven't increased my debug level yet in smb.conf but that's
probably what
> I'm going to try next.
Looks more like a network adapter problem than smbd problem.
What kind of network adapter is in the server, what switch is used?
Is line speed and full/half duplex autonegotiated or fixed?
Is the network interface reporting droped packets or overruns?