Appliedz/OS21 min
IPL and system start-up
What happens between pressing Load on the Hardware Management Console and a system ready for work: the load parameter, nucleus initialisation, parmlib, JES2 and the checks that prove a start-up went to plan.
What you will be able to do
- Explain what an IPL is, when sites do one and why it is planned like a change
- Read a load address and load parameter, and say what LOADxx and IEASYSxx contribute
- Follow the start-up sequence from NIP to JES2 and the subsystems
- Shut a system down in the right order and prove an IPL used the intended configuration
Lessons
- What an IPL is and when it happensAn IPL (initial program load) is how a z/OS system starts: the hardware reads a small start-up program from a disk, and that program builds the running operating system.
- From Load to a running systemThe load address names the disk to start from; the load parameter names the device holding the I/O configuration, the LOADxx member to use, how chatty and interactive start-up…
- Shutting down and checking an IPLA good IPL starts with a clean shutdown: subsystems stopped in order, then JES2, then the system.
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