Reference Guide

Chapter 4 SCSI Commands
PERSISTENT RESERVE IN Command (5Eh)
DLT-S4 Interface Reference Guide 216
REPORT CAPABILITIES
Service Action
4
The REPORT CAPABILITIES service action requests that the device server
return information on persistent reservation features. The format for the
3h Exclusive
Access
READS: Exclusive; any command from any initiator other than the initiator
holding the persistent reservation that attempts a transfer from the drive
results in a reservation conflict.
WRITES: Exclusive; any command from any initiator other than the initiator
holding the persistent reservation that attempts a transfer to the drive results
in a reservation conflict.
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVE OUT
command with the Reserve service action from any initiator other than the
initiator holding the persistent reservation results in a reservation conflict.
The initiator that holds the persistent reservation can reserve the logical unit,
extents, or elements as long as the persistent reservations do not conflict with
any reservations already known to the drive.
4h Obsolete ---
5h
WRITE
Exclusive
Registrants
Only
READS: Shared; any application client on any initiator may execute
commands that perform transfers from the drive to the host.
WRITES: Exclusive; any command from an initiator that has not previously
performed a Register service action with the drive that attempts a transfer to
the drive results in a reservation conflict.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical
unit, extents, or elements as long as the persistent reservations to not conflict
with any reservations already known to the drive.
6h Exclusive
Access
Registrants
Only
READS: Exclusive; any command from an initiator that has not previously
performed a Register service action with the drive that attempts a transfer
from the drive results in a reservation conflict.
WRITES: Exclusive; any command from an initiator that has not previously
performed a Register service action with the drive that attempts a transfer to
the drive results in a reservation conflict.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logical
unit, extents, or elements as long as the persistent reservations to not conflict
with any reservations already known to the drive.
7h - Fh Reserved Not applicable.
Code Name Description