Chapter 4 SCSI Commands
PERSISTENT RESERVE OUT Command (5Fh)
DLT-S4 Interface Reference Guide
221
See
table 123
for detailed descriptions of each of the
PERSISTENT
RESERVE OUT
command’s seven possible service actions (Service Action
codes appear in bits 0 to 4 of Byte 1).
02h
Release
Releases a persistent reservation.
03h
Clear
Clears all Reservation Keys and all persistent
reservations.
04h
Preempt
Preempts persistent reservations from another
initiator.
05h
Preempt & Abort
Preempts persistent reservations and/or removes
registrations and aborts all tasks for all preempted I_T
nexuses.
06h
Register and Ignore
Existing Key
Registers a Reservation Key with the tape drive;
Existing Reservation Key is ignored.
07h
Register and Move
Registers the specified initiator port and moves the
reservation to the initiator port.
See
table 123
for detailed descriptions of each of the Service Action codes.
Scope
The drive only supports reservations of the entire logical unit. Must be set to 0.
Type
Specifies the characteristics of the persistent reservation being established for all data
blocks within the extent or within the logical unit (see
table 124
for the applicable Type
codes and their meanings).
Parameter
List Length
Fields contained in the
PERSISTENT RESERVE OUT
parameter list specify the
Reservation Keys and extent information required to perform a persistent reservation.
Field
Description