Defining the sysplex couple data set for the star complex

You must format the sysplex couple data set to accept global resource serialization before you can:

When preparing a star complex, use the IXCL1DSU utility to allocate the sysplex couple data set.
Under the DEFINEDS statement for the TYPE(SYSPLEX) couple data set, add the following parameters:
Figure 1. Syntax of the Global Resource Serialization Record for IXCL1DSU
```
DEFINEDS
  DATA TYPE(SYSPLEX)
    ITEM NAME (GRS) NUMBER(1)
```
Where:
ITEM NAME(GRS) NUMBER(1)

Allocates the couple data set storage for use by global resource serialization.

The above keyword specification is a requirement for a star complex. If the specification is omitted, no storage will be allocated for use by global resource serialization. For more information on the utility, see z/OS MVS Setting Up a Sysplex.
You can format and bring on-line a sysplex couple data set with the global resource serialization record any time prior to migrating to a star complex. Use the SETXCF command to:
- Make a newly formatted sysplex couple data set the alternate sysplex couple data set, then
- Specify the alternate sysplex couple data set as the primary one.

For information on the use of the SETXCF command, see: