Quantum 1200 Series DAT Autochanger Guide de l'utilisateur télécharger pdf (Page 78)

LOG SELECT Command (4Ch) SDLT 600 SCSI Interface Guide

4-36 January 2005 81-81200-02 REV A01

8003h Total servo tracking errors

9000h-

9007h

Without substantial delay errors by channel

9080h-

9087h

Write only: Possible delay errors assignable to specific

channels

Read only: Raw sub-block read errors by channel

Note: Many of these errors are write, not read, errors and are

not to be included in read error-rate calculations. If

these errors are used to try to identify bad channels, the

bad channel may be on either the writing or reading

drive.

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

Parameter value for 05h is eight bytes; the Parameter Length field is

set to 8.

DU Disable Update. This bit is not defined for LOG SELECT; the drive ignores

any value in DU.

DS Disable Save. Not supported. DS and Target Save Disable (TSD) must be set

to 1. If DS or TSD or both are set to 0, the drive terminates the command

with CHECK CONDITION status, Sense Key set to ILLEGAL REQUEST,

and Additional Sense Code set to INVALID FIELD IN PARAMETER

LIST.

TSD Target Save Disable. Not supported. TSD and DS must be set to 1. If TSD or

DS or both are set to 0, the drive terminates the command with CHECK

CONDITION status, Sense Key set to ILLEGAL REQUEST, and

Additional Sense Code set to INVALID FIELD IN PARAMETER LIST.

ETC Enable Threshold Comparison. When set to 1, the drive performs a

comparison with threshold values once the cumulative value is updated.

Comparison criteria are defined in Threshold Met Criteria (TMC). If the

comparison is met and the RLEC bit of MODE SELECT / SENSE Control

Page 0Ah is set to 1, the drive generates a UNIT ATTENTION for all

initiators. The drive sets the Additional Sense Code to THRESHOLD

CONDITION MET. If the RLEC bit is 0 and the comparison is met, the

drive does not generate a UNIT ATTENTION.

TMC Threshold Met Criteria. Once the criteria specified in this field are met, the

ETC bit is 1, and the RLEC bit in the MODE SENSE / SELECT Control

Page is set to 1, the drive generates a UNIT ATTENTION for all initiators.

The criteria for comparison are:

Code Basis of Comparison

00b Every update of the cumulative value

Table 4-21. LOG SELECT Log Parameters — Field Descriptions (Continued)

Field Name Description

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 293 294

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Quantum 1200 Series DAT Autochanger Guide de l'utilisateur Page 78

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