Andrew,


In my experience, this kind of speed disparity isn't sufficiently large
enough for it to be the result of speed/duplex mismatch.

It's more like the differences that we see when one machine is an extra
router away   (i.e., client and server on same switch vs. client and
server on different switches with a couple of routers in between.)

When there have been settings mismatches, the fall in speed has
usually been 75 percent or worse.

What is the physical relationship between these machines and their
network?   But I agree that full duplex connnections (no flow control)
are always faster than their half duplex brethren.

On Tue, 10 Jun 2003, agascoyn wrote:

> Hi Marc
>
> The first thing is to check what your network cards are setup to run at.
>
> In our experience we have found that for optimum results you need to
> have your machine hard set to run at full 100mb/1000mb dependant on your
> setup.
>
> Plus the switch must be set the same otherwise this can cause the speed
> to slow down.
>
> Below is what your /etc/system file should be setup as to enforce the above:
>
> snip --->
>
> set hme:hme_adv_autoneg_cap=0
> set hme:hme_adv_100fdx_cap=1
> set hme:hme_adv_100hdx_cap=0
> set hme:hme_adv_10fdx_cap=0
> set hme:hme_adv_10hdx_cap=0
> set hme:hme_adv_100T4_cap=0
>
> end--->
>
> Hope this helps
>
> Marc Levitan wrote:
>
> >I have 1 backup that gets a rate of 28GB/hr  and another that is 43GB/hr.
> >
> >Both are Solaris 6 Servers running Networker 6.1.
> >Networker Server is Solaris 8 Networker 6.1.
> >
> >Both Clients are running Informix and both clients are storage nodes that
> >share DDS tape drives across the SAN.
> >
> >One client is a SUN E6500 (slower) the other is a SUN E10K (faster).
> >
> >Both have parallelism of 2.
> >
> >What can I check to determine why one is so much faster than the other?
> >
> >Thanks,
> >Marc Levitan
> >Storage Management Specialist
> >PFPC Global Funds Services
> >
> >--
> >Note: To sign off this list, send a "signoff networker" command via email
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> >
>
> --
> Andrew Gascoyne
> Unix Administrator
> European Southern Observatory
> Karl-Schwarzschild-Strasse 2
> D-85748 Garching bei Muenchen
>
> Phone: +49 89 32006443
> Fax  : +49 89 32006380
> EMail: agascoyn AT eso DOT org
>
> --
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--
=============================================================
Matthew Temple                Tel:    617/632-2597
Director, Research Computing  Fax:    617/582-7820
Dana-Farber Cancer Institute  mht AT research.dfci.harvard DOT edu
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