When mounting tapes in a multivolume sequence, you may want to designate an alternate tape drive in addition to the primary tape drive. When CA VM:Tape reaches the end of the tape on the primary drive it will mount the next tape in the sequence on the specified alternate drive.
The ALT option of the FILEDEF command lets you designate an alternate tape drive for CA VM:Tape to use. Using an alternate drive can decrease the amount of time required to run a job, because processing switches between the primary and alternate drive until CA VM:Tape reaches the end of the data set it is reading or writing. You do not have to wait for an operator to rewind and unload the primary tape before continuing with the next tape.
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