Quantum DLT 2000, Product Manual

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DLT2000 SCSI Interface
DLT2000/DLT2700 Cartridge Tape Subsystem 8-113
SCSI device specified in the Third-Party Device ID field. The drive preserves the
reservation until any one of the four conditions mentioned above occurs. The drive
ignores any attempt made by any other initiator to release the reservation and returns a
GOOD status.
An initiator that holds a current reservation may modify that reservation (for example,
to switch third-parties) by issuing another RESERVE UNIT to the drive.
8.4.19.1 Medium Changer Considerations
The optional Element reservation feature defined for Medium Changer devices in SCSI-
2 is not supported, so the RESERVE command is defined the same as for the tape
drive: Only the whole loader unit can be reserved. This is separate from a reservation of
the tape drive.
The RESERVE/RELEASE commands operate on a LUN basis; so the Medium
Changer and Tape Drive are generally handled as different devices. But in the case of a
reserved drive LUN, a MOVE MEDIUM command issued to the loader LUN can not
insert/remove a cartridge on the drive, unless the drive is reserved by the same initiator.