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SCSI Commands

Quantum DLT 8000 Tape System 5-83

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

Table 5–41 Disconnect / Reconnect 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.

Buffer Full Ratio Not supported. Any value is ignored.

Buffer Empty Ratio Not supported. Any value is ignored.

Bus Inactivity Limit Not supported. Any value is ignored.

Disconnect Time Limit Not supported. Any value is ignored.

Connect Time Limit Not supported. Any value is ignored.

Maximum Burst Size This value specifies the maximum amount of data that will be transferred

without disconnecting. A value of 0 sets no limit. Any value is in units of

512 bytes. For example, a value of 8 represents 4 Kbytes. Values that are

not multiples of 8 are rounded up to the closest multiple of 8.

DTDC Data Transfer Disconnect Control. This field defines further restrictions

for when disconnect is permitted.

DTDC Description

00b Data transfer disconnect control is not used. Disconnect is

controlled by the other fields in this page.

01b Once the data transfer of a command has been started a

target does not attempt to disconnect until all the data to be

transferred has been transferred.

10b Reserved.

11b Once the data transfer of a command has started, a target

does not attempt to disconnect until the command is

complete.

If DTDC is a non-zero value and the maximum burst size is non-zero, the

tape drive returns CHECK CONDITION status, sense key set to ILLEGAL

REQUEST and additional sense code set to ILLEGAL FIELD IN PARAMETER

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