SCSI Commands

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

Table 5–37 MODE SELECT Mode Parameter Header - Field Descriptions

Field Name

Description

 

 

Media Type

This field is ignored by the MODE SELECT command.

Buffered Mode

Default = 1. The drive implements immediate reporting on WRITE commands

 

through its buffered mode. With Buffered Mode set to 1, the drive reports

 

GOOD status on WRITE commands as soon as the data block has been

 

transferred to the buffer. If this field = 0, then the drive does not report GOOD

 

status on WRITE commands until the data blocks have been written to tape.

 

When Buffered Mode is not used, the tape drive suffers significant performance

 

degradation, and possible capacity, depending on tape format, block size, and

 

compression. When writing 2.6 or 6.0 GB formats and block size that is a

 

multiple of 4 Kbytes, there is no capacity loss. Likewise, when using the 10 or

 

20 GB format with compression disabled and block size a multiple of 8 Kbytes,

 

there is no capacity loss.

 

When writing 10 or 20 GB format with compression enabled and Buffered

 

Mode disabled, some capacity loss can occur. The block packing feature is

 

essentially disabled by turning off Buffered Mode.

 

If Buffered Mode is set to a number greater than 1, the command is rejected

 

with CHECK CONDITION, sense key of ILLEGAL REQUEST.

Speed

The tape drive supports only its default speed.

Block Descriptor

This field specifies the length in bytes of all the block descriptors. Since the

Length

drive only allows one block description, the value must be either 0 or 8. A value

 

of 0 indicates no block description is included; a value of 8 indicates a block

 

descriptor is present and precedes the mode page data. Any other value other

 

than 0 or 8 causes a CHECK CONDITION status with sense key of ILLEGAL

 

REQUEST to be returned.

 

 

Quantum DLT 7000 Tape System

5-69

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Quantum Instruments DLT 7000 manual Mode Select Mode Parameter Header Field Descriptions
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DLT 7000 specifications

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