Quantum DLT 8000 Manual descargar pdf (Pagina 304)

100

101

SCSI Commands

5-160 Quantum DLT 8000 Tape System

5.14 READ Command (08h)

This command transfers one or more data blocks or bytes to the initiator starting with

the next block on the tape.

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (08h)

1 Logical Unit Number Reserved SILI Fixed

2 - 4

(MSB)

Transfer Length

(LSB)

5 Unused Reserved Flag Link

Figure 5–71 READ Command Descriptor Block — Data Format

Table 5–72 READ Command Descriptor Block — Field Descriptions

Field Name Description

SILI Suppress Incorrect Length Indicator. If the SILI bit is set to 1 and the

Fixed bit is set to 1, the target terminates the command with CHECK

CONDITION status, sense key set to ILLEGAL REQUEST, and additional

sense code of INVALID FIELD IN CDB.

If the SILI bit is 0 and the actual block length is different than the

specified transfer length, a CHECK CONDITION status is returned.

Within the sense data, the Incorrect Length Indicator (ILI) bit and

Valid bit will be set to 1. The sense key field specifies NO SENSE. The

information bytes are set to the difference (residue) between the

requested transfer length and the actual block length., or, in Fixed

Block mode, the difference (residue) between the requested number

of blocks and the actual number of blocks read. No more than

transfer length blocks are transferred to the initiator and the tape is

logically positioned after the block (EOM side).

1 2 ... 299 300 301 302 303 304 305 306 307 308 309 ... 407 408

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