When I worked at P&H Mining, we IPL'd every Saturday. That worked very
well, as at 6:00 PM they shut down all of the onlines and did backups. To
shut down and IPL just added about 15 minutes. One big advantage to IPLing
every week is that the operators know how to do it. They deal with it every
week. When you IPL once a quarter or less, the operators forget. We were
manufacturing, which isn't near as critical to keep the system up 24/7,
although occasionally when the factory was really busy, we would skip the
IPL because they were running the factory on the weekend also.
I think IPLing more regularly keeps some things less fragmented, although I
doubt if that causes any real problems. Business need, as several have
said, should dictate how often you IPL. Certainly, changing releases of
z/OS requires an IPL, and major maintenance should be done with an IPL.
Eric Bielefeld
Sr. Systems Programmer
Milwaukee, Wisconsin
414-475-7434
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