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When CA MIA is running, we strongly recommend that you stop CA MIM on all systems, rather than on a subset of systems.
WARNING! Stopping CA MIM with a CA MIM SHUTDOWN LOCAL/FREE/RESERVE/DUMP (or z/OS STOP) command when GTAF is running may create data integrity exposures.
You can use either the z/OS STOP command or the CA MIM SHUTDOWN command to stop CA MIA. Both allow you to stop the product on the local system only or on all systems in the complex.
When CA MIA is not running, the operator may share tape devices manually by using z/OS VARY OFFLINE and VARY ONLINE commands, ensuring that each device is online to only one system at a time.
GTAF takes offline all unallocated devices on each system. This prevents z/OS from selecting these devices (because they could be in use on another system).
GTAF marks as PENDING OFFLINE all allocated devices on the system to which they are allocated. This causes the local z/OS operating system to take the devices offline as soon as they are deallocated. GTAF takes the devices offline on all other systems.
TPCF restores control to z/OS for any job that is in the allocation recovery process. TPCF replies with an invalid response to any outstanding z/OS IEF238D message, which restores control to z/OS and causes z/OS to prompt you for information.
CA recognizes that it may not be possible to quiesce all tape activity on a system. It is possible to safely stop CA MIM on one local system without quiescing all tape activity. However, it is not practical to document every situation that may occur under such circumstances.
We strongly recommend that you use caution if attempting to shut down a subset of the systems in the MIMplex. If you are not confident that you can safely avoid data integrity exposures, contact CA Technical Support for assistance.
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