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What really happens when the iSeries is started?

Can you tell me what happens when we start our iSeries system? For example: What subsystem gets called first and calls to the others subsystems, and in what sequence does this happen? Also, where is the information stored in the following cases?

1. When the system is shutdown completely (power supply is disconnected)?
2. When we execute commend PWRDWNSYS *IMMED.

Depending on your choice of the system value QCTLSBSD, the system will start differently. If the controlling subsystem is QCTL (which is the most common) the sequence of starting subsystems will be governed by the startup program (QSTRUP). Check the system value QSTRUPPGM. If it contains a program and library reference, you can check the source to see what is started after QCTL.


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