The 1 GHz of CPU for 1 Gbit of throughput rule can be broken if you are
utilizing TCP/IP offload from Alacritech.  The only
problem is that they only have drivers for Wintel and Linux.  By
offloading all the TCP/IP processing onto a TOE card, the
CPU is mostly idle though saturating Gbit E-net.

Cheers,

Phread

Phread Cichowski
Tivoli Storage Managment SE
phread AT us.ibm DOT com
(512)917-6905





Steve Harris <Steve_Harris AT HEALTH.QLD.GOV DOT AU>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
08/19/2003 05:40 PM
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Re: TSM MF to AIX sizing?



Matt

I did a sizing exercise a year or so back and figured that it takes about
1GHz of CPU power to run a Gig Ethernet card flat out, ie 1 CPU of current
generations.

Thus 2 CPUs should be enough if your throughput requirement will fit on a
single GigE adapter.
But, with the pricing the way it is, I'd be inclined to buy a 4 way box
that is partitionable.  In one partition run your test TSM server with 1
cpu and in the other run production TSM with the rest.  That should give
you acceptable performance, growing space and a test environment.

HTH

Steve Harris
AIX and TSM Admin
Queensland Health, Brisbane Australia

>>> Matt.Cooper AT AMGREETINGS DOT COM 20/08/2003 3:12:06 >>>
Hello all,
        WE are currently running TSM 515 on z/OS 1.1 (9672-x57 gen 6) and
are considering moving it to AIX to free up CPU cycles that are being used
during 1st shift.   As we consider that versus doing thing to make it run
better on 2nd and 3rd (use 2 TSM servers, FICON to TAPE instead of ESCON,
LAN FREE for a few big Servers) I need to know the characteristics of the
AIX box to move to.  We are backing up about 15TB a month now.  I don't
know
if we should be looking for a 2CPU machine or a 4CPU machine or if money
is
best spent on 2 of the fastest CPUs versus 4 old CPU's.  It is hard to
point
in a directions without knowing what the replacement system would be and
therefore its costs.  (yes I know that there is still 4GB of memeory, 2 GB
adapters, etc to cost out).   Is there anyone that can give my the voice
of
experience or point me in the proper direction to correctly work this
problem though?
Thanks in Advance
Matt



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