In configurations where the Arcserve Backup server is not in a SAN, each Arcserve Backup server is configured to control a mutually exclusive set of tape volumes in the Enterprise Tape Library 3494. As a result, each Arcserve Backup server manages a user-defined subset of tape volumes on the Enterprise Tape Library 3494 that are unique to that Arcserve Backup server.
Each Arcserve Backup server has an autonomous view of the Enterprise Tape Library 3494 that shows only the locally assigned volumes. The following illustration shows the architecture of the Arcserve Backup Enterprise Option for IBM 3494 and the communication interfaces to the Enterprise Tape Library 3494:
If multiple backup servers are sharing the same Enterprise Tape Library 3494, you must ensure that each tape volume is assigned to only one backup server. The tape volumes assigned to each backup server should be mutually exclusive, which means they cannot be used or accessed by other backup servers attached to the network.
Assigning mutually exclusive tape volumes requires careful planning. To assist you in your planning effort, you should document the tape volume assignment for each backup server that will share the Enterprise Tape Library 3494.
Important! If tape volumes are not mutually exclusive, or, are shared between backup servers, you risk losing important backup data.
Note: If you are adding backup servers to an established configuration, avoid duplication by checking the current tape volume assignments before adding the new backup servers.
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