From: Johnson, Craig E (Craig.E.Johnson@icn.siemens.com)
Date: Thu Oct 31 2002 - 18:56:41 EST
Hi all and thanks to those who responded. Responses are attached.
Basically, I tried everything suggested with no luck. We tried hardcoding
the switch, the boot config, the /etc/rc.config.d files to several different
settings (each time we matched the settings, of course), and nothing worked.
I had the LAN tech sit down with me and we worked side by side, and we've
done this before. In fact, I've had the problem with HP's connected to the
Enterasys switches before - which was solved by hardcoding to 100FD at each
end, the most recent a B2600 that I purchased in July, exhibited this
behaviour.
These C240's though seem to be a very different beast. It is my
understanding that these are the first HP C-class to support 100BaseT on
board, but apparently they don't work too well. We went so far as to
physically relocate one of them into the switch room to eliminate cabling
issues, and also tried different switches. Nothing changed - the fastest
throughput is still 10BaseT (1MB/sec). "lanadmin" doesn't show any framing
or other errors. I finally gave up and we set everything back to
auto-negotiate. When we do this, both the C240 and the switch claim 100FD,
but the speed indicates otherwise. Note that I am testing an NFS file
transfer, and I've tried it from GBE attached servers, 100BaseT attached
servers, and clients, with the same poor results. Other NFS clients running
at 100FD can transfer 100MB in about 10-11 seconds. The C240's range from
100 seconds to 2.5 minutes or more.
I've been working on this for two months, with HP, our LAN guys, even
Enterasys, and now this list. I was hoping for a miracle. Anyway, thanks
again for all the great responses - this is the best admin list going.
Craig
attached mail follows:
Forget trying to to set it in the hpbtlanconf file - you neen to interrupt
the boot and go into the Configuration menu. Set the Lan speed and duplex
with
LanConfig 100/Full_dx
or
LanConfig 100/Half_dx
I've never had any success with 100FullDuplex on the C240's - I set mine at
100HalfDuplex and hardcode the switch for the same. Funny - the C360's do
100HD just fine...
Here's a link to some useful discussion on performance problems with
auto-negotiated links
http://searchnetworking.techtarget.com/tip/1,289483,sid7_gci802539,00.html
<http://searchnetworking.techtarget.com/tip/1,289483,sid7_gci802539,00.html>
-----Original Message-----
From: Johnson, Craig E [mailto:Craig.E.Johnson@icn.siemens.com]
Sent: Thursday, October 31, 2002 12:43 PM
To: hpux-admin@DutchWorks.nl
Subject: [HPADM] 100BaseT Problem on C240's
I have two C240's running 10.20, fully patched, that exhibit bizarre
behaviour problems when running at 100FD. Basically, the throughput is
horrible. We've tried autonegotiate, we've tried hardcoding both host and
switch to 100FD, and many variations. My network folks are saying that this
is a problem with the C240's (which it well could be since other systems
seem to work fine), however, when we hooked two of them together using a
standalone Netgear hub (100HD), the throughput was fine. I recently
obtained a PCI LAN card and installed that, to see if that would make a
difference, but it didn't.
The core switches in our building are Enterasys E7's. I've seen problems
with HP's autonegotiating with these switches in the past, but it was always
correctable by hardcoding both ends to 100HD.
Any ideas folks? I'm running out of them.
Craig Johnson
Systems Administrator/Sr. Engineer
Siemens
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attached mail follows:
Probably the most common symptom there is for 100 BaseT. Autonegotiation
only
works on short cables and well-matched components. A 100Mbit LAN should
transfer data at 8-9 Mbytes/sec. A mismatched duplex will degrade to way
below
1 Mbyte/sec.
There are lots of technical issues why, but the only way to fix it is to
make
two changes: the CPU LAN card(s) must turn off autonegotiation and be locked
into 100FD mode, and secondly, the switch that the LAN cabel goes into must
also be locked.
Use lanadmin to verify the settings. There will NEVER be a collision on
100FD
(or FCS or framing errors, etc). If there are, the duplex is mismatched.
On Thu, 31 Oct 2002 10:42:34 -0800 "Johnson, Craig E"
<Craig.E.Johnson@icn.siemens.com> wrote:
> Message
>
> Basically, the
> throughput is horrible. We've tried
> autonegotiate, we've tried hardcoding both host
> and switch to 100FD, and many
> variations. My network folks are saying
> that this is a problem with the
> C240's (which it well could be since other
> systems seem to work fine), however,
> when we hooked two of them together using a
> standalone Netgear hub (100HD), the
> throughput was fine.
I would seriously question that you had the
CPU cards *and* the switches both set to 100FD
at the same time. Use lanaadmin to verify
everything (settings, error rates, etc)
-- Best regards, Bill Hassell, pooderbill@mindspring.com
attached mail follows:
Johnson, Craig E wrote:
> I have two C240's running 10.20, fully patched, that exhibit bizarre
> behaviour problems when running at 100FD. Basically, the throughput
> is horrible. We've tried autonegotiate, we've tried hardcoding both
> host and switch to 100FD, and many variations. My network folks are
> saying that this is a problem with the C240's (which it well could be
> since other systems seem to work fine), however, when we hooked two of
> them together using a standalone Netgear hub (100HD), the throughput
> was fine. I recently obtained a PCI LAN card and installed that, to
> see if that would make a difference, but it didn't.
>
> The core switches in our building are Enterasys E7's. I've seen
> problems with HP's autonegotiating with these switches in the past,
> but it was always correctable by hardcoding both ends to 100HD.
>
> Any ideas folks? I'm running out of them.
>
>
> Craig Johnson
> Systems Administrator/Sr. Engineer
> Siemens
>
>
You'll need to do 3 things:
1) Hard code the network switch to 100FD
2) Hard code the system to 100FD (in boot admin its 'co lc 100f')
3) edit the hpbase100conf file with the following:
HP_BASE100_INTERFACE_NAME[0]=lan0
HP_BASE100_STATION_ADDRESS[0]=
HP_BASE100_SPEED[0]=100FD
I have NO idea why this information has to be entered here in addition
to the hardware setting, but in my testing this is the only way I could
make it work and get good transfer rates.
--
Randy Ketner | 4380 Ziegler Rd., Ft. Collins, CO 80525-9790 | (970) 288-1184
Agilent Technologies | Technical Computing Support | ketner@ftc.agilent.com
"Product introductions from R&D are the lifeblood of our company"
- Ned Barnholt, CEO
attached mail follows:
Live with half duplex. We had the same problem with some C200s and were told
that the ethernet in the machine did not support FD. So what you have is a
mismatch the machine is at HD the switch is at FD. Set the port on the
switch to HD and performance should be decent. If you were able to get the
box set to FD then you got further than we did. We could not find any way to
set it to FD. That was when we were told by HP that it wasn't supported on
that hardware.
Bob Smart ( bob.smart@lmco.com <mailto:bob.smart@lmco.com> )
-----Original Message-----
From: Johnson, Craig E [mailto:Craig.E.Johnson@icn.siemens.com]
Sent: Thursday, October 31, 2002 1:43 PM
To: hpux-admin@DutchWorks.nl
Subject: [HPADM] 100BaseT Problem on C240's
I have two C240's running 10.20, fully patched, that exhibit bizarre
behaviour problems when running at 100FD. Basically, the throughput is
horrible. We've tried autonegotiate, we've tried hardcoding both host and
switch to 100FD, and many variations. My network folks are saying that this
is a problem with the C240's (which it well could be since other systems
seem to work fine), however, when we hooked two of them together using a
standalone Netgear hub (100HD), the throughput was fine. I recently
obtained a PCI LAN card and installed that, to see if that would make a
difference, but it didn't.
The core switches in our building are Enterasys E7's. I've seen problems
with HP's autonegotiating with these switches in the past, but it was always
correctable by hardcoding both ends to 100HD.
Any ideas folks? I'm running out of them.
Craig Johnson
Systems Administrator/Sr. Engineer
Siemens
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