User's Guide

Chapter 3 Emulated DLT7000 SCSI Commands
Release Unit (17h)
244 Quantum DX-Series Software Interface Guide
Media Changer
Considerations
3
The optional Element reservation feature defined for Medium Changer
devices in the SCSI-2 ANSI specification is not supported. The RELEASE
command is defined the same as for the tape drive. The whole loader unit
can be released. RESERVE / RELEASE of the Loader and Drive LUNs are
handled independently.
Reservation
ID
If the value is 1, the command releases all elements
reserved by the requesting initiator that were
reserved with the same
Reservation ID value as this
release attempt and that meet 3rd party release
requirements, if applicable.
Flag Bit The Flag bit is used in conjunction with the Link bit
to notify the initiator in an expedient manner that a
command has been completed.
Flag bits are not supported by the DX-Series system.
Link Bit A Link bit set to 1 indicates that the initiator
requests continuation of a task (an I/O process)
across two or more SCSI commands.
If the Link bit is 1 and the Flag bit is 0, and the task
completes successfully, the drive continues the task
and returns a status of INTERMEDIATE and a
LINKED COMMAND COMPLETE message.
If the Link bit and the Flag bit within a Control
word are both set to 1, and the drive completes a
command with a status of INTERMEDIATE, the
drive returns a LINKED COMMAND COMPLETE
message (with Flag).
Link bits are not supported by the DX-Series
system.
Field Name Description