SCSI Commands

LOG SENSE Command (4Dh) (continued)

Table 5–19 LOG SENSE Command Descriptor Block - Field Descriptions (continued)

Field Name

Description

 

 

Page Code

The Page Code field identifies which log page is being requested by the initiator.

 

If the page is not supported, then the command terminates with a CHECK

 

CONDITION status, sense key set to ILLEGAL REQUEST, and additional sense code

 

of INVALID FIELD IN CDB. Supported pages are:

 

Page Code

Page Definition

See Section

 

00h

List of Supported Pages Page

5.8.2

 

02h

Write Error Counter Page

5.8.3

 

03h

Read Error Counter Page

5.8.3

 

07h

Last n Errors Events Page

5.8.4

 

2Eh

TapeAlert Page

5.8.5

 

32h

Compression Ratio Page

5.8.6

 

33h

Device Wellness Log Page

5.8.7

 

3Eh

Device Status Log Page

5.8.8

Parameter

The Parameter Pointer field allows the host to specify at which parameter within a

Pointer

log page the requested data should begin. For example, if a page supports

 

parameters 0 through 5, and the Parameter Pointer contains 3, then only

 

parameters 3, 4, and 5 are returned to the initiator. Similarly, if a page supports

 

parameters 1, 3, and 6, and the Parameter Pointer contains 2, then only

 

parameters 3 and 6 are returned to the initiator.

 

If the Parameter Pointer is larger than the highest numbered parameter on the

 

page, then the target terminates the command with CHECK CONDITION status,

 

sense key set to ILLEGAL REQUEST, and additional sense code set to INVALID

 

FIELD IN CDB.

 

 

Note that parameters within a page are always returned in ascending order

 

according to parameter code.

 

 

If the target does not support a parameter code within this page then it does not

 

return any data associated with this parameter.

Allocation

The Allocation Length field is used to inform the target how much space the

Length

initiator has allocated for data. The host uses this field to limit the size of data

 

transfers to its own internal buffer size.

 

 

 

 

 

Quantum DLT 7000 Tape System

5-41

Page 145
Image 145
Quantum Instruments DLT 7000 manual Code Definition See Section

DLT 7000 specifications

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