You can control the area of storage into which JES2 loads these modules by placing copies of them in either the LNKLST or STEPLIB data set before you start JES2. Modules loaded into LPA are read-only; they cannot be replaced. The copy JES2 uses depends on where JES2 finds these modules. This gives you the flexibility to use copies that reside in CSA instead of PLPA. Using copies that reside in CSA eases migration and testing when your installation moves to a new level of JES2. If loaded into CSA, you do not need to IPL your member to obtain the new load modules following a JES2 restart.

See the STORAGE=CSA column of Table 1 for details about which copy JES2 will use.