RE: Help me Justify iSeries

Well, we are slowly reducing the arm count.  The old 730 had 65 arms;
that's dropped to 54 on it's i5 successor.  The old 830 has 62 and will
drop to 42 when it moves to an i5 in a few weeks.  I don't much even
worry about capacity anymore; the disks are so big that even under full
production we'll probably wind up well under 40% full.

There are certain things we wind up with in our JDE environment that
just totally slam the drives for extended periods.  Because of those I'm
not yet willing to chance a drastic reduction in arms as you've done.
EnterpriseOne workload, well, we've never gotten solid numbers with
requirements on current hardware (i.e. i5 systems, 2780s, 15K disks) so
I'm stuck having to estimate.  And I refuse to low-ball.  Neither IBM
nor JDE/Peoplesoft/Oracle could provide appropriate detail.

Anyway, the arm counts I'm mentioning are for the entire system, but
they will be LPARed.  The production partitions will actually top out at
42 arms and only 18 in DR.