Re: Slow network problems
From: Andreas Schulze (b79xan_at_gmx.de)
Date: Wed, 5 Jan 2005 14:57:07 +0100
"Peter Smithson" <firstname.lastname@example.org> schrieb im
> Our system administrator doesn't have time to look at this so I thought
> I'd have a look. I'm a developer and don't know much about networks
> etc. so please bear with me.
> We have a 64 bit AIX 5.2 box which can't use NFS due to time out errors.
> I've found that using ftp or rcp is very very slow - ftp reports about
> 20kb/s. This is between the AIX machine and another UNIX machine on a
> 100Mb/s ethernet hub.
> We've got about 10 or so UNIX machines on this hub running various
> versions of UNIX. We have a 32 bit AIX 4.3 machine which works fine.
> I've used SMIT to look at the ethernet card. It's set to auto
> negotiation which we've had problems with on other systems. Setting it
> to 100Mbs doesn't help.
> I tried doing an error log but nothing appeared in it other than the
> start/stop messages. While the error log was running I tried to use an
> NFS drive and got the usual error -
> A remote host did not respond within the timeout period.
> NFS write error on host sgnfs1: 78.
> Sorry if this is all a bit vague - can anyone talk me through how to
> investigate this?
You could use
# entstat -d ent0
to see (among other usefull stuff) collision statistics and media speed
running. Make sure that there are enough nfs daemons running on the nfs
server. And (as the other posters suggested) if you can avoid the auto
negotiation as AIX was never good with that (and still is not).