My €0.02
IPL - never scheduled. Only when needed. Typical scenarios:
1. Configuration error, which need IPL (very rare, fortunately)
2. Hardware or software changes require IPL (maybe once a year, but IMHO
less)
3. OPPORTUNITY. Yes - there are several disruptive application software
releases per year. There is no problem to "steal" half an hour for "our
own tasks" which may include IPL. However this point is usually
connected to 2. which means HW/SW changes simply wait for such opportunity.
IML/POR - never.
Exception could be disruptive machine maintenance, like memory (physical
DIMM) add or drawer preventive replacement.
In the past there were disruptive microcode driver changes.
--
Radoslaw Skorupka
Lodz, Poland
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