Quantum 1200 Series DAT Autochanger Guía de usuario descargar pdf (Pagina 88)

LOG SENSE Command (4Dh) SDLT 600 SCSI Interface Guide

4-46 January 2005 81-81200-02 REV A01

TMC Threshold Met Criteria. This field is valid only if the host sets the ETC bit

to 1. This field determines the basis for comparison. The host specifies this

field using the LOG SELECT command. If the result of comparison is true

(cumulative = threshold) and the MODE SELECT / SENSE Control Mode

Page RLEC bit is set to 1, the drive generates a UNIT ATTENTION for all

initiators. In that case, the drive sets the Sense Key to UNIT

ATTENTION, the Additional Sense Code to LOG EXCEPTION, and the

Additional Sense Code Qualifier to THRESHOLD CONDITION MET. If

the RLEC bit in Control Mode Page is 0, the drive does not generate a

UNIT ATTENTION.

Note that comparison is performed in real time. A LOG SENSE command

need not be issued to get the CHECK CONDITION status. Once ETC is

selected and the RLEC bit in Control Mode Page is set to 1, the drive

issues a CHECK CONDITION status based on the criteria defined in the

TMC bits if the criteria is met in real time. The CHECK CONDITION

status does not identify for which parameter code the criterion is met. The

host must issue a LOG SENSE command to read the counters to determine

for which parameter code the criterion has been met.

The criteria for comparison are:

Code Basis of Comparison

00b Every update of the cumulative value

01b Cumulative value equal to threshold value

10b Cumulative value not equal to threshold value

11b Cumulative value greater than threshold value

LBIN List Binary. Not used.

LP List Parameter. The drive treats the parameter codes as data counters.

Always set to 0.

Parameter Length Specifies the number of bytes in the parameter value. All parameters are 4

bytes in length except parameter 0005h, which is 8 bytes in length.

Parameter Value Indicates the actual value of this log parameter.

Table 4-24. Log Parameters for Read / Write Error LOG SENSE Page —

Field Descriptions (Continued)

Field Name Description

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 293 294

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