z/OS DFSMShsm Implementation and Customization Guide
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Tape support parameter

z/OS DFSMShsm Implementation and Customization Guide
SC23-6869-01

Tapes are required to verify tape migration and tape backup. If your system does not include those functions, remove the tape verification job (?AUTHIDF, see Figure 1) from the FVP.

Mount requests for scratch tapes (PRIVAT) appear when DFSMShsm requires a tape for backup, migration, or dump processing. When a scratch tape is selected, it is automatically placed under DFSMShsm control. After the FVP has completed, issue the DELVOL PURGE command to remove scratch tapes from DFSMShsm control. The following parameter applies to tape verification and to dump verification:
?TAPEUNT
Tape unit identification.

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