Many of the values that represent the fundamental decisions you make about the systems in your sysplex are in parmlib. The following list describes the key parmlib members you need to consider when setting up an MVS™ system to run in a sysplex:

• IEASYSxx is the system parameter list, which holds parameter values that control the initialization of MVS. Some parameters identify other members of parmlib that are to be used. (For example, the GRSCNF system parameter identifies the GRSCNFxx member.)
• COUPLExx contains parameter values that reflect sysplex-related information.
• GRSCNFxx describes the global resource serialization complex for the system.
• GRSRNLxx specifies the resource name lists to be used to control the serialization of resources in the complex.
• CLOCKxx indicates how the time of day is to be set on the system.
• IEASYMxx provides a single place to define system parameters and system symbols for all systems in a sysplex.
• LOADxx optionally specifies the following:
  • The name of a sysplex in which a system participates, which is also the substitution text for the &SYSPLEX system symbol
  • One or more IEASYMxx parmlib members that specify the system symbols and system parameters to be used.
• XCFPOLxx specifications are used only if a sysplex failure management policy is not active in the sysplex. Functions provided through XCFPOLxx can provide high availability for multisystem applications on an MVS system on PR/SM™. If SFM is active in the sysplex, then the SFM policy specifications can define the same PR/SM reconfiguration actions that can be defined through XCFPOLxx.
• CONSOLxx contains values that define your console configuration.