Advanced Topics › Product Termination Considerations › Global Shutdown Processing › How You Automatically Free a System From the MIMplex

How You Automatically Free a System From the MIMplex

The auto FREE feature provides a means to automate the FREE command operation for a CA MIM member on a failed system in a sysplex. The auto FREE feature functions independently of the MIMplex control file communication methodology.

The auto FREE feature works by reacting to a notification event provided by the XCF/XES operating system component, which describes that a system has been removed from the active sysplex.

Note: For information on sysplex member removal, see the IBM MVS guide Setting Up a Sysplex.

The MIMplex can be a subset of a sysplex, or it can be comprised of more than one sysplex. As long as one member of a sysplex survives to provide a system down notification event, the auto FREE feature automatically FREEs the removed MIMplex member. A MIMplex member must be a member of a sysplex to be automatically freed with auto FREE. The system down notification event is provided by the XCF/XES operating system component, in a sysplex environment.

In addition to the MIMplex configuration relationship to the sysplex configuration, consider the following regarding the use of the auto FREE feature:

• The auto FREE feature is controlled by the SETOPTION MIM DOWNSYS command and can be enabled or disabled on an individual system basis in the MIMplex. DOWNSYS=AUTOFREE needs to be specified on the surviving sysplex member to react to the incoming system down event.
• To relate CA MIM system names with z/OS system names, the z/OS system name, rather than the z/OS SMF ID, must be specified on the DEFSYS statement. The z/OS system name is defined on the SYSNAME keyword of the IEASYSnn member of the z/OS SYS1.PARMLIB data set. The z/OS DISPLAY XCF,SYSPLEX,ALL command can be used to list all of the z/OS system names in a given sysplex. Alternately, the z/OS DISPLAY SYMBOLS command shows the local z/OS system name for the &SYSNAME variable name.