The efficient operation of the tape library under CA 1 requires every tape to be identified by a unique volume serial number and physically stored in volume serial sequence. Numbers should be assigned consecutively when possible.
CA 1 controls volumes having alphanumeric volume serial numbers; however, a translation of that alphanumeric into a numeric may be necessary. If necessary a translation scheme is specified at installation time through two exit routines and is used for internal system processing only. The TMSBLDUE utility can be used to assist in this translation. Externally, an alphanumeric volume serial number is always used.
Note: To determine if these exits are necessary in your environment, see the Utilities and Reports Reference Guide.
If the Scratch Pool Management feature is being used, a request for a pool-controlled tape must be satisfied by mounting a volume within the defined scratch pool range, or the volume is demounted and the request reissued.
Utilities such as DITTO that copy from tape mark to tape mark should not be used to copy tapes under the control of CA 1. This causes a mismatch between the volume serial number on the external reel label and the volume serial number in the tape label record. Utilities such as CA 1 Copycat or IEBGENER that use normal OPEN logic are recommended for tape-to-tape copy functions.
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