ADSM-L

Network tuning question -- AIX to AIX

2006-07-17 10:00:37
Subject: Network tuning question -- AIX to AIX
From: "Kauffman, Tom" <KauffmanT AT NIBCO DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 17 Jul 2006 09:59:22 -0400
We finally figured out that ehterchannel was not doing what we wanted
last week, so we re-configured our gigabit ethernet adapters as
individual adapters on six separate internal networks. Now I've run into
another interesting observation.

I can fire up one interface from a client system to my TSM server with
the ftp process coverd in the tuning doc (from /dev/zero to /dev/null)
and get 110 MB per second over the interface. If I then fire up the
second interface on the same client to the TSM server -- I get 110
MB/sec as an aggregate; both interfaces run at 55 to 58 MB/sec. This is
not a TSM server constraint; I can get all six interfaces running at 110
MB/sec if I run one process on each of six clients.

So it's a client tuning issue -- and not a problem with input from
/dev/zero, as these results mirror my TDP/R3 backups this weekend. Any
suggestions on what knobs to tweak? Better yet, any suggestions on how
to determine what resource constraint I'm hitting? I'm beating my way
through the various redbooks that cover network tuning, but this can be
time-consuming.

TIA

Tom Kauffman
NIBCO, Inc
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