CA VM:Backup can write data to more than one drive during a single backup or MPC job if you or an authorized client specify creation of tape copies. Tape copies are duplicate tapes created at the same time on different drives. Tape copies can enhance data security, are useful for offsite or vault storage, and can aid in recovering from tape I/O problems. A backup or MPC job can create up to four copies in addition to the primary (first) tape.
The data written to each tape copy is identical. If one tape is longer than the other, the extra footage on the longer tape is not used. The only differences between the tapes are the volser in the VOL1 label, certain control information in the header and trailer labels, and, optionally, different expiration dates and data set names. A restore or MPC job can use any copy as input in place of the primary tape.
The job template file specifies the number of tape copies a job should create. For more information, see the backup template OUTPUT record in the Template Programming Interface Guide or the chapter "Managing Backup Job Template Files" in the Administration Guide.
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