Data sets can be dynamically restored in the TSO user region by way of the RESTORE command. The command processor, if needed, dynamically allocates a tape drive, for the period of time necessary to restore the requested data set.
Note: Use of the dynamic (immediate) restore command requires that the RESTORE command processor be designated as privileged. This is necessary due to the use of the ENQ and ALLOCATE SVCs.
A facility is available to allow the installation to limit the number of tape units that can be concurrently allocated in support of TSO RESTORE commands. When the limit has been reached, execution of the command processor results in a response to the user that the command will have to be reissued at a later time.
This support does not require the dedication of tape units for its use. At the time of a restore request, an attempt is made to allocate a tape drive, if needed, according to the protocol observed by the system allocate function. Deallocation occurs immediately after the data set is restored.
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