Specifying an alternate master (system) catalog

Another way to change the system at an IPL is to tell the system to select an alternate master catalog. Use one of the following methods:

• Identify the data set that contains the alternate master catalog on the SYSCAT statement in the LOADxx parmlib member.
• Tell the system to read a member of SYS1.NUCLEUS that is different from SYSCATLG, the default member. Respond to system message IEA347A with a two-character suffix. The two characters are appended to SYSCAT to form the member name that the system is to read.

The system prompts the operator for a SYSCAT suffix only if you:

• Do not specify the SYSCAT statement in LOADxx
• Specify, through the SYSCTL frame, an initialization message suppression indicator (IMSI) on the LOAD parameter that tells the system to prompt for the master catalog response.