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Yes. When you power off the system and then manually power it back
on, the IPL process spends time restarting all the hardware and performing hardware diagnostics. If you do a PWRDWNSYS OPTION(*IMMED) RESTART(*YES *SYS) only the operating system will be restarted and this is significantly faster.
RESTART(*YES *SYS) is the default used when you specify PWRDWNSYS
OPTION(*IMMED) RESTART(*YES) because the PWRDWNSYS command uses the IPL
attributes set via the CHGIPLA command.
There is one exception to this rule though. If you are applying a PTF that requires a hardware restart before it can be applied, the IPL is forced to RESTART(*YES *FULL) even if you don't specifically specify it. ==================================
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