Library /sys$common/syshlp/SYSMANHELP.HLB  —  Sys Parameters, TAPE_ALLOCLASS
    TAPE_ALLOCLASS determines the tape allocation class for the
    system. The tape allocation class creates a unique clusterwide
    device name for multiple access paths to the same tape.

    The TAPE_ALLOCLASS parameter can also be used to generate a
    unique clusterwide name for tape devices with identical unit
    numbers.
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