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CA recommends that you always use a second BES subsystem to act as a failover for the primary BES system. The main prerequisite is that the failover BES subsystem must share the same primary and mirror databases with the primary BES system. The tape exits determine the status of the primary BES system. If the primary BES system has unexpectedly terminated or is attempting to shut down, the failover BES subsystem is selected for encryption and decryption. If the primary BES system receives a command to stop, it will not shut down until all encryption or decryption tasks using its services have terminated.
This diagram illustrates the relationship between the primary BES system and the failover BES subsystem:
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