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DLT1/VS80 SCSI Interface Guide
81-81276-01 Rev A01
July 2004
4-25
4.8.1 Error Detection Summary in LOG SENSE CDB
The following conditions constitute errors that the tape drive detects in relation to the CDB. It sets the
request sense data to ILLEGAL REQUEST, INVALID FIELD IN CDB.
•
A page is unsupported.
•
A Parameter Pointer is larger than the highest numbered parameter on the page.
•
An SP bit is 1.
•
An Allocation Length is smaller than the data being returned by the target.
Page Code
Page Code. This field identifies which log page the initiator is requesting. If the
page is not supported, the command terminates with a CHECK CONDITION
status, with the Sense Key set to ILLEGAL REQUEST, and an Additional Sense
Code of INVALID FIELD IN CDB. Supported pages follow:
Page Code
00h
02h
03h
07h
2Eh
32h
33h
3Eh
Page Description
List of Supported Pages Page
Write Error Counter Page
Read Error Counter Page
Last
n
Errors Events Page
TapeAlert Log Page
Compression Ratio Page
Device Wellness Log Page
Device Status Log Page
Parameter Pointer
Parameter Pointer. This field allows the host to specify at which parameter within a
log page the requested data should begin. For example, if a page supports
parameters 0 through 5, and the Parameter Pointer field contains 3, the target
returns only parameters 3, 4, and 5 to the initiator. Similarly, if a page supports
parameters 1, 3, and 6, and the Parameter Pointer field contains 2, the target returns
only parameters 3 and 6 to the initiator.
If Parameter Pointer is larger than the highest numbered parameter on the page, the
target terminates the command with CHECK CONDITION status. The Sense Key
is ILLEGAL REQUEST and the Additional Sense Code is INVALID FIELD IN
CDB.
Note:
The target always returns parameters within a page in ascending order
according to parameter code.
Allocation Length
Allocation Length. This field informs the target how much space the initiator has
allocated for data. There must be sufficient space allocated for all the requested
data, otherwise the command terminates with a CHECK CONDITION status, with
Sense Key of ILLEGAL REQUEST, and Additional Sense Code (ASC) of
INVALID FIELD IN CDB.
Table 4-14.
LOG SENSE (4Dh) Command Descriptor Block — Field Descriptions
(Continued)
Field Name
Description
Summary of Contents for DLT1/VS80 SCSI
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Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
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Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
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