Quantum 1200 Series DAT Autochanger Betriebsanweisung PDF herunterladen (Seite 127)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-85

Table 4-51. Device Configuration MODE SELECT Page — Field Descriptions

Field Name Description

PS Parameters Savable. For MODE SELECT, must be set to 0.

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

10h identifies this as the Device Configuration Page.

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

is returned in MODE SENSE commands and must subsequently be set to

the same value when performing MODE SELECT. If the drive receives an

unexpected page length value, it returns a CHECK CONDITION status,

Sense Key set to ILLEGAL REQUEST.

CAF Change Active Format. Not supported. Must be set to 0.

Active Format Not supported. Must be set to 0.

Active Partition The drive only supports partition 0. Setting this field to any other value

causes the drive to reject the command and return a CHECK CONDITION

status, Sense Key set to ILLEGAL REQUEST.

Write Buffer Full

Ratio

The drive sets this field to 0. The drive uses an automatic adaptive

mechanism to adjust its Write Buffer Full Ratio according to the average

data rates over the SCSI bus.

Read Buffer

Empty Ratio

The drive sets this field to 0. The drive uses an automatic adaptive

mechanism to adjust its Read Buffer Empty Ratio according to the average

data rates over the SCSI bus.

Write Delay Time Indicates the maximum time, in 100 ms increments, that the drive waits

with a partially full buffer before forcing the data to tape. The buffer Full /

Empty ratio, which is dynamic, can cause data to be written sooner than the

Write Delay Time would indicate. The Write Delay Time defaults to 100

(64h). This causes the drive to flush the buffer in 10 seconds. The

maximum value is 6500 (1964h); the minimum value is 15 (0Fh),

representing a range from 11 minutes to 1.5 seconds.

A value of 0 disables forcing data to tape based on time in the buffer. The

drive rounds values greater than 6500 down to 6500.

DBR Data Buffer Recovery. Not supported. Must be set to 0.

BIS Block Identifiers Supported. This bit is supported and must be set to 1.

RSmk Report Setmark. Not supported. Must be set to 0.

AVC Automatic Velocity Control. Not supported. Must be set to 0.

SOCF Stop on Consecutive Filemarks. Not supported. Must be set to 0.

RBO Recover Buffer Order. Not supported. Must be set to 0.

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