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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-33

4.7.1 Overview: LOG SELECT Command Descriptor Block

Errors

The following conditions constitute errors that the drive detects in relation to the CDB. The Request

Sense Data is set to Sense Key of ILLEGAL REQUEST, and Additional Sense Code set to INVALID

FIELD IN CDB.

The conditions that constitute errors are:

• PCR bit is set to 1 and Parameter List Length field is not set to 0.

• Both the PCR and SP bits are set to 1.

• A Parameter List Length that would cause a parameter within a valid page to be truncated or

otherwise incompletely initialized.

4.7.2 Operation of LOG SELECT

The LOG SELECT command allows the initiator to modify and initialize parameters within the logs

the drive supports.

The two ways to initialize the log parameters are:

1. Set the PCR bit to 1 in the LOG SELECT CDB; this clears all parameters.

2. Specify the log page and parameter values as the log parameters to clear individual pages. The

following pages can be cleared using this method:

If an initiator sends multiple pages during the DATA OUT phase, it must send them in ascending order

according to page code. Otherwise, the drive terminates the command with a CHECK CONDITION

status, Sense Key set to ILLEGAL REQUEST, and Additional Sense Code set to INVALID FIELD IN

PARAMETER LIST. The drive returns the same status if an unsupported page code appears in any

header or if the specified page cannot be cleared.

Table 4-19. LOG SELECT Page-clearing Codes

Page Code Page Description

02h Write Error Count Page

03h Read Error Count Page

32h Compression Ratio Page

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 293 294

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