SCSI Commands

5.4INQUIRY COMMAND (12h)

The INQUIRY command allows the initiator to determine the kind of SCSI devices attached to its SCSI Bus. It causes a device that is attached to a SCSI Bus to return information about itself. The drive identifies itself as a Direct Access Storage Device that implements the SCSI-2 protocol. The drive does not need to access its tape medium to respond to the inquiry.

The drive can provide two categories of data in response to an INQUIRY command: Standard Inquiry Data and Vital Product Data. Standard Inquiry Data contains basic data about the drive, and Vital Product Data comprises several pages of additional data. Each Vital Product Data page requires a separate INQUIRY command from the initiator.

An INQUIRY command is not affected by, nor does it clear, a Unit Attention condition.

 

Bit

7

 

6

5

4

 

3

 

2

1

 

0

 

 

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

Operation Code (12h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Logical Unit Number

 

 

Reserved

 

 

EVPD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

Page Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

Allocation Length

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

Unused

 

 

 

Reserved

 

Flag

 

Link

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5–4

INQUIRY Command Descriptor Block - Data Format

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Quantum DLT 7000 Tape System

 

 

5-15

 

Page 118 Page 120
Page 119
Image 119
Quantum Instruments DLT 7000 manual Inquiry Command 12h, Inquiry Command Descriptor Block Data Format, Evpd
Page 118 Page 120

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