Quantum 1200 Series DAT Autochanger Guía de usuario descargar pdf (Pagina 53)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-11

4.4 INQUIRY Command (12h)

The INQUIRY command allows the initiator to direct all attached devices to return information about

themselves. SDLT devices respond by providing a variety of information, including their World Wide

Name and other important characteristics. The SDLT tape drive identifies itself as a Sequential Access

Storage Device that implements the SCSI-3 protocol.

NOTE: The tape drive does not need to access its tape medium to respond to the

INQUIRY command.

The drive can provide different categories of data in response to an INQUIRY command:

• Standard Inquiry Data — contains basic data about the drive, including vendor-specific inquiry

data that precisely identifies the revision of SDLT tape drive subsystem components.

• Vital Product Data — comprises several pages of additional data. Each Vital Product Data page

requires a separate INQUIRY command from the initiator. To see a list of specific Vital Product

Data pages returned by this SDLT tape drive, refer to “Supported Vital Product Data Page (00h)”

on page 4-17.

An INQUIRY command is neither affected by—nor does it clear—a Unit Attention condition.

Figure 4-2. INQUIRY Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (12h)

1 Reserved Obsolete EVPD

2 Page Code

3 – 4

(MSB)

Allocation Length

(LSB)

5 Control

SDLT 600

SCSI Interface Guide

SCSI Commands

81-81200-02

REV A01

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 293 294

Sin comentarios

Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 53