A DASD control file is a data set that resides on a shared DASD volume. The control file is used to communicate CA MIM transactions to all systems within the MIMplex. To use a DASD file for communication, the file must reside on a volume accessible by all systems participating in the MIMplex.
DASD control files must be predefined. A sample control file allocation job is provided with the CA MIM installation. The size of the DASD control file is specified in the JCL and the DASD volume that is to contain the data set.
The CA MIM address space on each system contends for access to the DASD control file by issuing hardware reserve requests. Access to the control file is serialized, because only one system can reserve the control file at any given moment.
Use the MIMINIT ALLOCATE statement to allocate a DASD control file to CA MIM during the initialization. In addition, you can issue the ALLOCATE command dynamically while CA MIM is executing. Once CA MIM allocates a DASD control file , you can migrate to it to begin using DASD control file communications.
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