User's Guide

Chapter 2 Emulated Medium Changer SCSI Commands
Release (17h)
72 Quantum DX-Series Software Interface Guide
• If the 3rdPty bit is 1, the unit or elements released were
originally reserved by the same initiator using the 3rd party
reservation option, and if the device is the same SCSI device that
was specified in the 3rd party device ID (3rd Party ID) field
• Element ID
The Element field specifies whether this command is a Unit Release.
• If the value is 0, the command releases a reservation placed on
this unit by the requesting initiator that meets 3rd party release
requirements, if applicable.
• 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.