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PERSISTENT RESERVE IN Command (5Eh) SDLT 600 SCSI Interface Guide

4-136 January 2005 81-81200-02 REV A01

Table 4-77. PERSISTENT RESERVE IN Command — Field Descriptions

Field

Name

Description

Service

Action

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

Code Name Description

00h Read Keys Reads all registered reservation keys.

01h Read

Reservations

Reads all current persistent reservations.

02h Report

Capabilities

Returns persistent reservation capability information.

A Read Keys service action requests that the drive return a parameter list that

includes a header and a complete list of all of the reservation keys currently

registered with the drive. If multiple initiators have registered with the same key, the

key is listed multiple times, once for each registration. Refer to Figure 4-77 on

page 4-137 and Table 4-78 on page 4-138 for information about Read Keys

parameter data.

A Read Reservations service action requests that the drive return a parameter list

that contains a header and a complete list of all persistent reservations presently

active in the drive. Refer to Figure 4-78 on page 4-138 and Table 4-79 on

page 4-139 for information about Read Reservations parameter data.

Allocation

Length

This field indicates how much space is reserved for the returned parameter list

(Read Keys or Read Reservations parameters). The actual length of the parameter

data is indicated in the parameter data field for those parameters.

If the Allocation Length is not sufficient to contain the entire list of parameters, the

drive returns a truncated list. If the remainder of the list is required, the host must

send a new PERSISTENT RESERVE IN command with an Allocation Length field

value large enough to contain the entire list of parameters.

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 178