RE: IPL

Our production system we have scheduled to IPL after each weekly full
system save.  But is overkill.  It was reasonable in the pre-7xx
hardware days; maybe even further back.  But since then there's been
little true reason to.  A big reason to IPL was reclaiming of temporary
addresses (see WRKSYSSTS) but the temp address space is so large now I
doubt any but the very largest of shops run in to issues.

We're a couple of weeks from retiring the old production 730 in favor of
a partition on a 570.  Once on the 570 I plan to eliminate regular IPLs.

Or DR/dev box we IPL as necessary .. Mostly for PTFs or if there's a
maintenance item.  So it was getting IPLed about 2-3 times a year.  It
is also about to turn into an LPARed 570 at which time the practice will
continue .. IPL only as necessary.