SCSI Commands

LOG SENSE Command (4Dh) (continued)

Table 5–21 Log Parameters for Read /Write Error LOG SENSE Page Field Descriptions

(continued)

Field Name

Description

Parameter Code

8000h - Vendor Unique

(continued)

9000h - Vendor Unique

 

 

Note: Parameter codes 00h, 01h, and 04h always return a value of 0.

 

Parameter value for 05h is 8 bytes; the parameter length is set to 8.

DU

Disable Update. This field with a value 0 indicates that the target will update

 

all log parameter values. This field set to 1 indicates that the target will not

 

update the log parameter values except in response to LOG SELECT. This bit is

 

set by the drive when accumulated values reach maximum. This is also

 

returned set to 1 if the host set the bit in the last LOG SELECT command.

 

Default is 0.

 

Note that for parameter types other than threshold and cumulative values, this

 

bit is always 0.

DS

Disable Save. Not supported; always set to 1.

TSD

Target Save Disable. Not supported; always set to 1.

ETC

Enable Threshold Comparison. When set to 1, indicates that comparison to

 

threshold is performed. ETC of 0 indicates that the comparison is not

 

performed. This bit is set to 1 by MODE SELECT. Default is 0.

TMC

Threshold Met Criteria. This field is valid only if host sets ETC to 1. It

 

determines the basis for comparison and is specified by host using LOG

 

SELECT. If the result of comparison is true (cumulative = threshold), and

 

MODE SELECT / SENSE Control Mode page RLEC bit is set to 1, then a UNIT

 

ATTENTION is granted for all initiators. The sense key is set to UNIT ATTENTION,

 

the additional sense code to LOG EXCEPTION, and ASCQ is set to THRESHOLD

 

CONDITION MET. If the RLEC bit in Control Mode page is 0, then UNIT

 

ATTENTION is not generated.

 

Note that comparison is performed in real time. A Log Sense command need

 

not be issued to get the check condition. Once ETC is selected, RLEC bit in

 

control mode page, the check condition is issued based on the criteria defined

 

in the TMC bits if the criteria are met in real time. Check condition will not

 

identify for which parameter code the criteria is met. Log Sense must be

 

issued to read the counters to determine for which parameter code criteria

 

has been met.

 

 

5-46

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Default is
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DLT 7000 specifications

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