Re: IPL Processing Sequence

On 08-Feb-2012 12:31 , Rich Loeber wrote:

Does anyone know where I can find a description of the sequence of
steps and when they get processed during an IPL? I have some OS
maintenance I want to do during the QSTRUP program, some of which
affects exit point registration. I'm finding that some server
functions are getting started before I can complete what I need to do
in the QSTRUP and the results are not always pretty. It would help
to know what is happening during the IPL at each stage and what
triggers each event to happen.

FWiW: What is officially the IPL, has effectively completed by the time the startup program runs; some asynchronous IPL activity may complete in some "system jobs", most notably the SCPF [Start CPF] job which is the job that performs each step of the IPL. Work performed in an effective "change system at IPL" processing of a manual IPL runs in the SCPF job. The end of the IPL is the restricted-state preceding the optional start of the controlling subsystem. Thus knowing the steps of the IPL likely will be of little use, and instead, the knowledge of the system Work Management for the post-IPL startup of\from the controlling subsystem [QCTLSBSD] is probably what would be of interest. That is, the starting of "server functions" is an effect of having started the controlling subsystem.

Regards, Chuck