You shouldn't just pick based on rated capacity. You need to know your LPAR
configuration to determine what is best model. You should read my article in
Planet Mainframe, "Don't Buy More MIPS - Do This Instead". Also if you are
really only 55 total MSU shop you are on a Business class machine. When you
move from z14 to z16 which has much faster engines, you will need 1 less for
same MSU.
A z14 3907-B05 rated at 53 MSUs would migrate to a z16 3932-B04 rated at 53
MSUs. Reducing # of physical GCPs increases Logical to Physical ratio and is
typically not good for performance.
On Saturday, June 13, 2026 at 10:58:24 PM CDT, IBM-MAIN automatic digest
system <[email protected]> wrote:
There is 1 message totaling 16 lines in this issue.
Topics of the day:
1. Selecting z model MSU
----------------------------------------------------------------------
Date: Sat, 13 Jun 2026 02:48:29 -0500
From: Brian Westerman <[email protected]>
Subject: Re: Selecting z model MSU
If you can, and your workload can use them, get as many zIIP processors as you
can.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
------------------------------
End of IBM-MAIN Digest - 12 Jun 2026 to 13 Jun 2026 (#2026-154)
***************************************************************
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
