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Setting COMMUINICATION=NONE option lets you test start CA MIM without any cross-system communication capabilities. This method is used for pre-production testing.
When you specify MIMINIT COMMUNICATION=NONE, no I/O operations are performed to DASD or coupling facility structure or CTC devices. Therefore, neither the Global Data Set Integrity Facility (GDIF) nor the Global Tape Allocation Facility (GTAF) can be activated. These are global facilities that require a cross-system communication method.
MIMINIT COMMUNCATION=NONE is generally used in conjunction with the ICMF communication method between two geographically remote systems. Because DASD or coupling facility structures and CTC devices cannot usually be connected between geographically remote systems, no data can be transported using these traditional methods. Use MIMINIT COMMUNICATION=NONE when ICMF is activated to connect a geographically remote system to the MIMplex through CA‑L‑Serv.
MIMINIT COMMUNICATION=NONE can also be used to test certain CA MIM facilities on one system. While CA MIM is primarily used to manage global resources, several of its facilities have single-system features and responsibilities. With COMMUNICATION=NONE, you can test the following CA MIM facilities:
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