I'm not sure we have a white paper. Will one of our announcement
letters do?
"z/OS V2.1 is designed to allow System z servers to run at utilization
levels as high as 100%."
From
http://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/8/649/ENUSA13-0568/index.html&lang=en&request_locale=null
A Long Time Ago in a Data Center Far, Far Away (well, OK, just down the
road from Poughkeepsie in East Fishkill), we used to routinely run at
100% busy during peak times on some systems and for days on end on
others. So long as there was enough discretionary work to fill up the
box, no harm, no foul.
There was even a (WSC?) recommendation at one point (perhaps the MVS/ESA
SP Version 3 timeframe) to run BR15s, one per processor, in their own
RPGN and in a PGN with very low priority, and subtract that workload
from the resulting, constant 100% busy to find out "how busy the system
really was." This was a measurement trick to counter some low
utilization effects that existed at the time.
Customers have told me they routinely run 100% busy at peak times rather
more recently.
In my opinion this has been a very positive aspect of the platform for a
really long time (like 30 years or more!). It's so ingrained we often
forget to talk about it...along with a number of other imporant things
about which we should perhaps remind people about more often.
Chris McGavic wrote:
All,
I'm trying to find a white paper or something along that line that states that
the mainframe platform (we're on a z/10) can actually run at 100% and not die
as opposed to other platforms.
--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
ee...@us.ibm.com
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