The PLPA must be reloaded: (1) at the first IPL after system initialization, when the system loads it automatically, (2) at an IPL after the installation has added or modified one or more modules in the LPALST concatenation, has tested the alteration, and now wants to put the replacement module(s) in the PLPA, and (3) at an IPL after the PLPA page data set has been damaged (and is therefore unusable) and its contents must be restored. The PLPA can also be reloaded for other reasons (such as when the addition of more storage causes the nucleus and the PLPA to overlap). Reloading the PLPA should be discretionary; that is, it should not be a common occurrence. It should be done only when necessary because the associated I/O slows down the IPL and because previously existing VIO data set pages are not preserved.
To reload the PLPA from the LPALST concatenation, the operator enters CLPA (create link pack area) as one of the responses to the SPECIFY SYSTEM PARAMETERS prompt. For more information about loading the PLPA, see the CLPA parameter in IEASYSxx (system parameter list).