User's Guide

Chapter 2 Media Changer Commands
Persistent Reserve Out Command (5Fh)
Quantum SuperLoader 3 Software Interface Guide 82
Table 38 Persistent Reserve
Out Command Service Action
Code Name Description
00h Register When the command executes a
Register service action, it registers a
reservation key with a device server without generating a reservation. The
device server holds these reservation keys from each initiator that
performs a
PERSISTENT RESERVE OUT command with a Register service
action until the key is changed by a new
PERSISTENT RESERVE OUT
command with Register service action from the same initiator, or until the
initiator registration is removed by:
Powering down the logical unit, if the last
Activate Persist Through Power
Loss
(APTPL; see figure 51 on page 88 and table 40 on page 89) received
by the device server was 0;
Performing a
Clear service action;
Performing a
Pre-empt service action;
Performing a
Pre-empt and Clear service action; or
Performing a
Register service action from the same initiator with the
value of the service action reservation key set to 0.
When a reservation key has not yet been established or when the
reservation key has been removed, a reservation key of 0 is used when the
initiator performs a
PERSISTENT RESERVE OUT with the Register service
action. When the reservation has been removed, no information is
reported for the initiator in the
Read Keys service action of the resulting
PERSISTENT RESERVE IN command.
01h Reserve A
PERSISTENT RESERVE OUT command with Reserve service action
creates a persistent reservation with a specified
Scope and Type.
Persistent reservations are not superseded by a new persistent reservation
from any initiator except by the execution of a
PERSISTENT RESERVE OUT
command that specifies a
Release, Clear, Pre-empt, or Pre-empt and Clear
service action.