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Chapter 4 SCSI Commands

LOG SELECT Command (4Ch)

DLT-S4 Interface Reference Guide 59

Overview—LOG SELECT

Command Descriptor

Block Errors

The following conditions constitute errors that the drive detects in

relation to the CDB. If the drive detects one of the conditions listed, it will

return

CHECK CONDITION with the Sense Key set to ILLEGAL REQUEST

and the Additional Sense Code set to INVALID FIELD IN CDB.

The conditions that constitute errors are:

• PCR bit is set to 1; 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.

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:

Table 34 LOG SELECT Page-

clearing Codes

Page Code Page Description

02h Write Error Count Page

03h Read Error Count Page

0Ch Sequential Access Device Page

38h General Purpose Non-Volatile Log Page

Note: If an initiator sends multiple pages, 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.

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