SCSI Commands

5.1.4 DATA-Phase Command Components

Many of the SCSI commands cause data to be transferred between the initiator and the drive. The content and characteristics of this data are command- dependent. Table 5–5 lists the information transmitted for all of the commands.

The "Length in CDB" column of Table 5–5 identifies the Command Descriptor Block field used by the drive to determine how much command-related data are to be transferred. The units (bytes or logical blocks) for the different Length fields are implied by the Length Field Name as follows:

Field Name

Units Implied

Allocation Length

Bytes of data the drive is allowed to send to the initiator

Parameter List Length

Bytes of data the initiator has available for the drive

Transfer Length

Logical number of data blocks or data bytes the initiator

 

wants transferred or verified

Byte Transfer Length

Bytes of data the initiator wants transferred

The DATA OUT column in Table 5–5 lists the information passed to the drive by the initiator as part of the command. The DATA IN column lists the information sent to the initiator by the drive. Numbers in parentheses after an item indicate the item’s length in bytes. In some cases, additional length information is communicated during the DATA phase.

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Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual DATA-Phase Command Components
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