Hello
I'm having a problem with my 450 (running 4.3.3) when it is connected to a LanCast 10mbp switch.
Put simply. performance is terrible when switch is in my network and clients are acessing the 450 (which is attached to the switch with a crossover cable).
If I remove the the switch from the network, all is well.
I've sent the switch back to be tested and it is fine. Other UNIX servers in my network give great performance with or with the switch as do the clients.
I've thought about half/full duplex issues on the 450's ethernet but its set correctly on the netapp and I've read that the 450 does support full-duplex anyway.
Any ideas as to why my 450 doesn't like the switch?
Regards
Mark Richards
On Fri, 10 Apr 1998, Mark Richards wrote:
I've thought about half/full duplex issues on the 450's ethernet but its set correctly on the netapp and I've read that the 450 does support full-duplex anyway.
Any ideas as to why my 450 doesn't like the switch?
considering i wasted a substantial chunk of this week on exactly that issue, i'd say *check the duplexity*.
yes, all sorts of things are happy running full-duplex, but there doesn't seem to be a rock-solid protocol for autodetection of duplex state yet. even our (not particularly cheap) CISCO catalyst switch can't do it reliably.
if you can't interrogate your switch, and it doesn't have duplex-state idiot lights, you might try switching the toaster back to half-duplex and seeing if that improves matters.
i would also look at the output of "netstat -i" on the toaster; if the ratio of ierrs to ipkts is more than about 1:10^5, i'd also consider that strong evidence of a duplexity problem.
hth.
Tom Yates - Unix Chap - The Mathworks, Inc. - +1 (508) 647 7561 MAG#65061 DoD#0135 AMA#461546 1024/CFDFDE39 0C E7 46 60 BB 96 87 05 04 BD FB F8 BB 20 C1 8C
On Fri, 10 Apr 1998, Mark Richards wrote:
Put simply. performance is terrible when switch is in my network and clients are acessing the 450 (which is attached to the switch with a crossover cable).
If I remove the the switch from the network, all is well.
I've sent the switch back to be tested and it is fine. Other UNIX servers in my network give great performance with or with the switch as do the clients.
I've thought about half/full duplex issues on the 450's ethernet but its set correctly on the netapp and I've read that the 450 does support full-duplex anyway.
Any ideas as to why my 450 doesn't like the switch?
None whatsoever.
We ran into a similar problem with a F210, Cisco Catalyst and Sun Ultra Enterprise 1s and 3000s.
Checked everything. Cisco checked the catalyst. Sun checked the Suns. NetApp engineers came and played.
Gave up in the end...it just appeared everytime the switch came into the equation performance dropped off. Back to back Ethernet cable was just fine.
-marc
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Hippocampus OSD, Inc. "Industrial Strength Internet Solutions" vox://416.979.9000 fax://416.979.8223 http://www.hippocampus.net
-
Marc Nicholas -
Mark Richards -
Tom Yates