MTC devices can be equipped with a stacker which can hold several cartridges. BS2000 supports these stackers for pre-mounting cartridges in FDDRL runs when AUTOMATIC mode is set on the stacker. The stackers can be used as follows:
When mounting cartridges, the system prefers MTC devices with stackers. When processing continuation tapes, the MTC device already used is retained in the device suggestion of the mount request. The operator need only confirm the suggestion.
The TAPE operand of the DUMP statements specifies the VSNs of the cartridges to be used. The cartridges are inserted in the stacker of the MTC device in the same order. When one cartridge has been filled with data, the system waits for the stacker to load another one before requesting the next cartridge. If the desired VSN matches that of the next cartridge in the stacker, FDDRL accepts the cartridge automatically.
The cartridges to be used are not specified in the
TAPEoperand (TAPE=*ANYwith the DUMP statements orTAPE=*BY-OPERATORwith the RELOAD statements). A stacker is loaded with cartridges. In the subsequent mount request (NKVT013), the operator can enter the mnemonic name of the MTC device together with the suffix “-ALL“. The system now expects all continuation cartridges to be automatically loaded onto the same MTC device and it assigns them without any further mount messages.