Another less common way to change the system at an IPL is to cause
the IPL program to read a member of a nucleus data set that is different
from IEANUC01, the default nucleus member. One reason for such a nucleus
switch may be the need to apply a PTF to the nucleus. You can IPL
a secondary (alternate) nucleus by either of the following methods:
- Editing the alternate nucleus character of the LOAD parameter
string before selecting the "initialize SCP" function. Use the system
control (SYSCTL) frame of the system console. Modify the last character
of the eight-character parameter string to specify the suffix for
IEANUC0x. The IPL program retrieves this character from the system
console frame and concatenates it as a suffix to IEANUC0 to form the alternate
SYS1.NUCLEUS member name.
- Using the NUCLEUS statement of the LOADxx member to specify the desired alternate
IEANUC0x member. See LOADxx (system configuration data sets) for more information.
Note: When you specify an alternate nucleus, the proper architectural
extension of the nucleus must also exist. See
ARCHLVL for more information about architectural extensions to the nucleus.