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PERSISTENT RESERVE OUT Command (5Fh) SDLT 600 SCSI Interface Guide

4-144 January 2005 81-81200-02 REV A01

The following table provides 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).

Table 4-83. PERSISTENT RESERVE OUT Command’s Service Action Descriptions

Code Name Description

00h Register When the command executes a Register service action, it registers a

Reservation Key with the drive without generating a reservation. The

drive holds these Reservation Keys from each initiator that performs a

PERSISTENT RESERVE OUT command with a Register service action

until a new PERSISTENT RESERVE OUT command with Register

service action from the same initiator changes the key or until the

initiator registration is removed by any of the following:

• Powering down the drive, if the last Activate Persist Through Power

Loss (APTPL; see Figure 4-81 on page 4-149 and Table 4-85 on

page 4-150) the drive received was 0.

• Performing a Clear service action.

• Performing a Pre-empt service action.

• Performing a Pre-empt & Clear service action.

• 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 issues a PERSISTENT RESERVE OUT command with the

information is reported for the initiator in the Read Keys service action of

the resulting PERSISTENT RESERVE IN command.

01h Reserved 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Persistent reservations are not superseded by a new persistent reservation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 &

Clear service action.

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 186