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AS400 IPL Types

Hello Team,

Could you please tell me the difference between IPL Type A and IPL Type B? IPL B is used for routine work like ...PTF , LICPGM installation , Post monthly backups and for free up some space .... so what is the purpose of IPL A ?

on what scenarios we use IPL Type C?

Regards
Avinash Chandra
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VP Technology / Senior Consultant
Commented:
"A" and "B" are two copies of system LIC (Licensed Internal Code).  A is unmodified, and B has PTFs applied.  A is a fallback copy of LIC in case a PTF applied to B side causes a critical problem, you can still IPL from the A copy of the LIC.

"C" is reserved for IBM service personnel.

"D" is alternate IPL from disk or tape.

https://www.ibm.com/support/knowledgecenter/en/ssw_i5_54/rzal2/rzal2ipltypeco.htm
Thanks Gary