Quantum 1200 Series DAT Autochanger Podręcznik Użytkownika Pobierz pdf (Strona 83)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-41

4.8.1 Error Summary in LOG SENSE Command Descriptor

Block

The following conditions constitute errors the drive detects relating to the LOG SENSE CDB. The

drive terminates the command with CHECK CONDITION status, Sense Key set to ILLEGAL

REQUEST, and Additional Sense Code set to INVALID FIELD IN CDB.

Error conditions occur when:

• The drive does not support the requested page.

• The parameter pointer is larger than the highest numbered parameter on the page.

• The SP bit is set to 1.

0Ch Sequential Access Device Log Page Page 4-49

0Dh Temperature Log Page Page 4-51

2Eh TapeAlert Log Page Page 4-53

32h Read / Write Compression Ratio Log Page Page 4-57

33h Device Wellness Log Page Page 4-61

3Eh Device Status Log Page Page 4-64

Parameter

Pointer

The Parameter Pointer 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 contains 3, the drive returns

only parameters 3, 4, and 5 to the host. Similarly, if a page supports parameters

1, 3, and 6, and the Parameter Pointer contains 2, the drive returns only

parameters 3 and 6 to the host.

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

page, the drive 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 the drive always returns parameters within a page in ascending order

according to the parameter code.

If the drive does not support a parameter code within a page, it does not return

any data associated with that parameter.

Allocation

Length

Specifies the maximum number of bytes that the host allocated for returning

data. The host uses this field to limit the size of data transfers to its own internal

buffer size.

Table 4-22. LOG SENSE Command Descriptor Block — Field Descriptions (Continued)

Field Name Description

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 293 294

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Quantum 1200 Series DAT Autochanger Podręcznik Użytkownika Strona 83