SCSI Commands

LOG SELECT Command (4Ch) (continued)

5.7.1Log Detection Summary in LOG SELECT Command Descriptor Block

The following conditions constitute errors that are detected by the drive in relation to the CDB. The request sense data is set to ILLEGAL REQUEST, INVALID FIELD IN CDB.

The conditions that constitute errors are:

∙PCR bit is set to 1 and parameter list is not set to 0.

∙SP bit is set to 1

∙A parameter list length that would cause a parameter within a valid page to be truncated or otherwise incompletely initialized.

5.7.2Operation of LOG SELECT

The LOG SELECT command allows the initiator to modify and initialize parameters within the logs supported by the tape drive.

There are two ways to initialize the log parameters.

1.Set the PCR bit 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:

Page Code

Page Description

02h

Write Error Count Page

03h

Read Error Count Page

32h

Compression Ratio Page

If multiple pages are sent during the DATA OUT phase, they must be sent in ascending order according to page code. Otherwise, the command terminates with a CHECK CONDITION status, sense key set to ILLEGAL REQUEST, and additional sense code set to INVALID FIELD IN PARAMETER LIST. The same status is returned if an unsupported Page Code appears in any header or if the specified page cannot be cleared.

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Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Log Detection Summary in LOG Select Command Descriptor Block, Operation of LOG Select
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DLT 7000 specifications

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