Converting the SMS configuration from compatibility to 32-system mode

When converting to 32-system mode, you must convert all systems in the SMSplex at the same time. Use the procedure that follows.

Note: The procedure indicates that the ACDS is converted first, followed by the COMMDS. However, due to the nature of parallel tasks in SMS, these conversions may be reversed, so that the COMMDS is converted first.

Set a date and time for the conversion when the allocation activity on the system is low.
Create an SCDS, ACDS, and COMMDS by copying existing SMS control data sets. Ensure that you have the correct data set space allocations. Refer to Allocating control data sets for space requirements for converting to 32-system mode.
To provide for emergency fallback, do not convert your existing SCDS, ACDS, and COMMDS.
On each system in the SMSplex, create an IGDSMSxx member of SYS1.PARMLIB that points to the new ACDS and COMMDS and specifies SYSTEMS(32).
Immediately before conversion, issue the command SETSMS INTERVAL(999) on all systems sharing the ACDS and COMMDS. This prevents a system from rereading the COMMDS and attempting to activate the new configuration before you have an opportunity to change the mode of that system.

On one system in the SMSplex, issue the command SET SMS=xx to restart SMS or re-IPL the system using the new IGDSMSxx member of SYS1.PARMLIB. This restarts SMS in 32-system name mode using the new ACDS and COMMDS. The following sequence of messages will be received on this system that accesses the new control data sets:

IGD064I ACDS dsname SUPPORTS ONLY 8 SYSTEMS
IGD092I WARNING: YOU MUST BE PREPARED TO CONVERT ALL SYSTEMS IN
        THE SMSPLEX. FAILURE TO DO SO MAY CAUSE ERRORS ACCESSING
        THE CONFIGURATION DATA SET(S).
IGD067D REPLY 'CONVERT' TO ALLOW CONVERSION OF ACDS TO SUPPORT
        MORE THAN 8 SYSTEMS OR 'REJECT' TO FAIL THE REQUEST

Reply 'CONVERT' to complete the conversion of the ACDS.

        IGD039I   ACDS dsname HAS BEEN CONVERTED TO SUPPORT MORE THAN 8
                  SYSTEMS.
        IGD009I   ACDS SWITCHED TO dsname

Note: At this point, your ACDS has been converted and you are about to convert the COMMDS.

        IGD064I  COMMDS dsname SUPPORTS ONLY 8 SYSTEMS
        IGD092I WARNING: YOU MUST BE PREPARED TO CONVERT ALL SYSTEMS IN
                THE SMSPLEX. FAILURE TO DO SO MAY CAUSE ERRORS ACCESSING
                THE CONFIGURATION DATA SET(S).
        IGD067D REPLY 'CONVERT' TO ALLOW CONVERSION OF COMMDS TO SUPPORT
                MORE THAN 8 SYSTEMS OR 'REJECT' TO FAIL THE REQUEST

Reply 'CONVERT' to complete the conversion of the COMMDS.

        IGD039I   COMMDS dsname HAS BEEN CONVERTED TO SUPPORT MORE THAN 8
                  SYSTEMS.
        IGD009I   COMMDS SWITCHED TO dsname

On the remaining systems in the SMSplex, issue the command SET SMS=xx to restart SMS or re-IPL the system using the new IGDSMSxx member of SYS1.PARMLIB for that system. This restarts SMS in 32-system name mode using the new ACDS and COMMDS. The following sequence of messages will be received on this system that accesses the new control data sets:
```
IGD009I ACDS SWITCHED TO dsname
IGD009I COMMDS SWITCHED TO dsname
```