Quantum 1200 Series DAT Autochanger Podręcznik Użytkownika Pobierz pdf (Strona 165)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-123

Table 4-69. Device Configuration MODE SENSE Page — Field Descriptions

Field Name Description

PS Parameters Savable. Not supported. Always set to 0.

Page Code Identifies the type of MODE SENSE page being transferred. A value of

10h identifies this as the Device Configuration page.

Page Length Indicates the number of bytes in the page, excluding bytes 0 and 1. The

length is returned on MODE SENSE and must subsequently be set to

the same value when performing MODE SELECT.

CAF Change Active Format. Not supported.

Active Format Not supported.

Active Partition Indicates the current logical partition number in use. Always set to 0.

The drive only supports partition 0.

Write Buffer Full

Ratio

Indicates how full the buffer should be before the drive restarts writing

to the medium. The drive sets this field to 0 (unused) since it uses an

automatic adaptive mechanism to adjust its ratio dynamically according

to the average data rates over the SCSI bus.

Read Buffer Empty

Ratio

Indicates how empty the buffer should be before the drive restarts

reading from the medium. The drive sets this field to 0 (unused) since it

uses an automatic adaptive mechanism to adjust its ratio dynamically

according to the average data rates over the SCSI bus.

Write Delay Time Indicates the maximum time in 100 msec increments that the drive

waits with a partially fully buffer before forcing the data to tape. Note

that the buffer full / empty ratio, which is dynamic, can cause the drive

to write data sooner than the WRITE delay time value indicates. The

WRITE delay time defaults to 100 (64h). This causes the drive to flush

the buffer after 10 seconds. The minimum value is 15 (Fh), the

maximum value is 6500 (1964h), representing a range in delay of 1.5

seconds to 11 minutes.

DBR Data Recovery. Not supported. Always set to 0.

BIS Block Identifiers Supported. This bit is supported and is always set

to 1.

RSmk Report Setmark. Not supported. Always set to 0.

AVC Automatic Velocity Control. Not supported. Always set to 0.

SOCF Stop on Consecutive Filemarks. Not supported. Always set to 0.

RBO Recover Buffer Order. Not supported. Always set to 0.

1 2 ... 160 161 162 163 164 165 166 167 168 169 170 ... 293 294

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Quantum 1200 Series DAT Autochanger Podręcznik Użytkownika Strona 165