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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-143

Table 4-82. PERSISTENT RESERVE OUT Command — Field Descriptions

Field Name Description

Service

Action

The following service action codes are available. All other values are reserved.

Code Name Description

00h Register Registers a Reservation Key with the drive.

01h Reserve Creates a persistent reservation using a Reservation

Key.

02h Release Releases a persistent reservation.

03h Clear Clears all Reservation Keys and all persistent

reservations.

04h Pre-empt Pre-empts persistent reservations from another

initiator.

05h Pre-empt

& Clear

Pre-empts persistent reservations from another

initiator and clears the task set for the pre-empted

initiator.

06h Register &

Ignore

Existing

Key

Registers a Reservation Key with the tape drive;

Existing Reservation Key is ignored.

Note: Refer to Table 4-83 on page 4-144 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. Refer to Table 4-84

on page 4-148 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.

The parameter list is 24 bytes in length; thus, the Parameter List Length field is

always set to 24 (18h).

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