Quantum DLT 8000 Product Manual page 349

RESERVE UNIT (10) Command (56h) (continued)
Table 5–91 RESERVE UNIT (10) Command — Field Descriptions
Field
3rd Pty
LongID
Third Party Device ID
Description
When set to 1, it indicates that the Third Party Device ID field is valid.
When 0, indicates that the third party device associated with the reservation
release has a number smaller than 255 and the ID value can be sent within
the CDB. If set = 1, indicates that the third party device ID is greater than 255,
the ID value within the CDB is ignored, and the parameter list length is at least
eight.
Required and used only when the 3rdPty bit is set, in which case this field
specifies the SCSI ID of the initiator to be granted the reservation of the
logical unit. The drive preserves the reservation until one of the following
occurs:
It is superseded by another valid RESERVE command from the initiator;
It is released by the same initiator;
It is released by a TARGET RESET message from any initiator;
It is released by a TARGET RESET message from any initiator; or
It is released by a hard reset condition.
The drive ignores any attempt to release the reservation made by any other
initiator. For example, if ID7 sends ID2 a Third Party reservation on behalf of
ID6 (the target at ID2 gets reserved for the initiator ID6), then only ID7 can
release the target at ID2 (using a Third Party release). ID6 cannot release the
reservation even though the reservation was made on its behalf.
Quantum DLT 8000 Tape System
SCSI Commands
(continued)
5-205