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You should run your workloads through the IBM Workload Estimator (tough to
quantify exactly, but may give you a general feel). I would also recommend
contacting Midrange Performance Group about their "Second Opinion Service"
using their Performance Navigator product. It's a client piece that will
collect some performance info that their analysts can use to size an
upgrade or confirm a purchase decision you're looking at. In addition,
they offer this as a free service to customers of certain business
partners... not sure what the criteria is on that offering, though. A good
business partner will have no problem helping you make this decision and
you should feel you can trust them, or their not a good business partner.
;)
Rather than throwing tons of CPW capacity at your processes, you may find
that the new disk and I/O features will make a world of difference. Also
important may be main storage, etc. For that kind of decision you need
some hard data to make it correctly... it may cost you some work or some
amount of $$ cost for expert help, but that can be justified by being able
to purchase the right machine for your needs (BIG difference in price
between those models...).
"Dave Snyder"
<dsnyder@xxxxxxxx
om> To
Sent by: <midrange-l@xxxxxxxxxxxx>
midrange-l-bounce cc
s@xxxxxxxxxxxx
Subject
520 model debate
09/07/2005 09:21
AM
Please respond to
Midrange Systems
Technical
Discussion
<midrange-l@midra
nge.com>
We are currently running a model 820-2395 (370 cpw). Our batch
processing is taking too long (8 hours) and online response is slow at
times.
The debate is on (and must be finalized by Sept 30) on whether we
upgrade to a 520/0902/7459 (1,000cpw) or a 520/0903/7453 (2,400cpw). We
can buy a 2400cpw machine now and pay less (in totality) than what it
would cost to upgrade later from the 1000cpw machine. However, the
debate is:
- do we need the 2400cpw now? will it be overkill?
- will the cost to upgrade to the 2400cpw machine decrease by this time
next year?
If anyone has migrated from an 820 to a 520 and would like to share
their experiences, especially performance-wise, that would be helpful.
Any insight is helpful.
Dave
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