SCSI Commands

MODE SELECT (6) / (10) Command (15h) / (55h) (continued)

Table 5–44 Device Configuration Page - Field Descriptions

Field Name

Description

PS

Parameters Savable. For MODE SELECT, this bit must be 0.

Additional Page Length

This field indicates the number bytes in the page. However, the value

 

does not include 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 page length does not match that

 

expected by the drive, a CHECK CONDITION status is returned, sense key

 

set to ILLEGAL REQUEST.

 

The drive returns a CHECK CONDITION status with sense key set to

 

ILLEGAL REQUEST if it receives an unsupported Page Code or a Page field

 

with values not supported or changeable. In such cases, no parameters

 

are changed as a result of the command.

CAP

Change Active Partition. Not supported; must be 0.

CAF

Change Active Format. Not supported; must be 0.

Active Format

Not supported. Must be 0.

Active Partition

Only partition 0 is supported. Setting this field to any other value causes

 

rejection by the drive with a CHECK CONDITION status, sense key ILLEGAL

 

REQUEST set.

Write Buffer Full Ratio

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

 

mechanism to adjust its Full Ratio according to the average data rates

 

over the SCSI bus.

Read Buffer Empty

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

Ratio

mechanism to adjust its Empty Ratio according to the average data rates

 

over the SCSI bus.

Write Delay Time

This field indicates the maximum time that the drive will wait with a

 

partially full buffer before forcing the data to tape (100 ms increments).

 

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 200 (C8h). This causes the buffer to be flushed in 20

 

seconds. Maximum value is 6500 (1964h) and the minimum is 15 (0Fh).

 

This represents a range from 11 minutes down to 1.5 seconds.

 

Values between 0 and 15 on a MODE SELECT, are rounded down to 0.

 

This causes the data to go straight to the medium without delay.

 

 

Quantum DLT 7000 Tape System

5-83

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Quantum Instruments DLT 7000 manual Device Configuration Page Field Descriptions, Cap, Caf
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