Make a newly formatted couple data set available to the sysplex

This section applies when you already have WLM couple data sets, have just allocated new WLM couple data sets, and want to make them available to the sysplex. You do this, for example, if you want to increase the size of the existing WLM couple data sets.

You must use a series of SETXCF command to switch from the currently active primary and alternate couple data sets to the new couple data sets. All systems in the sysplex then operate with the newly allocated data set.

If you are making newly formatted WLM couple data sets available to the sysplex, you can continue to use an older WLM application to modify, install and activate your service definition (as long as new functions are not exploited), or you can switch to using the z/OS Release 2 WLM application.

For more information on compatibility of release levels, WLM application levels, couple data set formats, and functionality levels, see Service definition functionality levels, CDS format levels, and WLM application levels.

Example of making re-allocated couple data sets available

Allocate two new couple data sets as described in Allocate a WLM couple data set For this example, it is assumed you want a primary and an alternate couple data set, and that the names of the new data sets are SYS1.WLMP residing on volume SYS001, and SYS1.WLMA residing on volume SYS002.
Make SYS1.WLMP the alternate using the command:
```
     SETXCF COUPLE,TYPE=WLM,ACOUPLE=(SYS1.WLMP,SYS001)
```
As part of this processing, SETXCF copies the contents of the current primary WLM couple data set to SYS1.WLMP which now is the new alternate.
Switch SYS1.WLMP to primary using the command:
```
     SETXCF COUPLE,TYPE=WLM,PSWITCH
```
Now make SYS1.WLMA the new alternate using the command:
```
     SETXCF COUPLE,TYPE=WLM,ACOUPLE=(SYS1.WLMA,SYS002)
```
As in Step 1, this causes the contents of the new primary WLM couple data set SYS1.WLMP to be copied to the new alternate SYS1.WLMA.