What would drive alot of people to the 525 is the ability to attach
expansion units. 6 PCI slots (with two needing to be IOPs most likely) get
eaten up pretty quickly!




Pete Helgren
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10/25/2007 05:20
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515 - 525 side by side comparison

Please respond to
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Hardware and performance gurus:

At the lower end of the scale, can you see an advantage to getting a 525
over a 515? Lets say you have 30 users, need 200GB of disk space (you
are at 75% utilized at 52GB now but plan for some growth) and you plan
to get 4GB of RAM. Most of your processing is interactive RPG programs
that update data with minimal amounts of batch processing. You are
doing some web based program hosting but not much, although you expect
that in a couple of years you may be replacing more of the RPG 5250
programs with RPG CGI-type web programs. There might be some Java web
applications running. You don't need LPARs and the user population
might grow to 45 or so in the next 3 years.

I don't see any compelling reason to buy the 525 over the 515. Or am I
missing something? Unless you are in a high growth situation, it seems
to me that the 515 wouldn't run out of gas before it was due for
replacement in 3-5 years. Since there isn't a limitation any more on
the number of users a 515 can be licensed for, even if you doubled the
number of users, I can't see where a 525 would be the better choice.
The only thing I can think of is that more disk arms will improve
performance, but if the data store need is modest, putting in a bunch of
disks to improve performance seems like overkill.

Seems to me there is a bit of overlap at the low end of the 515/525
scale. What say you?

Thanks,

Pete Helgren



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