Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 401)

100

101

Message Processing in Data Out Phase (WRITE

Command)

Figure D-7 shows how each message is processed during the Data

Out phase of a WRITE command.

Parity Error in User Data Associated with WRITE Command

When parity checking is enabled and the CTS detects a parity error in

the logical blocks of user data received from the initiator, the CTS

aborts the data transfer. The data block containing the parity error is

not written to tape.

After aborting the data transfer, the CTS sends Check Condition

status to the initiator, followed by a Command Complete message.

The sense key is set to Aborted Command (Bh) and the ASC and

ASCQ bytes are set to 47h and 00h. The SCSI Bus Parity Error (BPE)

bitissetto1.

If you are attempting to write a variable-length block, you may be

able to recover by reissuing the WRITE command an unlimited

number of times. Each time a failure is detected, the CTS returns

Check Condition status.

If you are attempting to write fixed-length blocks, you may be

able to recover by following these steps:

1. Issue a REQUEST SENSE command.

2. Look at the Information Bytes to determine how many fixed

blocks need to be re-sent. These bytes indicate how many

logical blocks were not transferred successfully (including

the logical block with the parity error).

3. Adjust the initiator’s data pointer to reflect the number of

blocks that were successfully transferred.

4. Issue a WRITE command to re-send the blocks that were not

successfully transferred.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

D-15

Appendix D SCSI Bus Message Processing and Error Recovery

1 2 ... 396 397 398 399 400 401 402 403 404 405 406 ... 445 446

Comentários a estes Manuais

Sem comentários

Exabyte EXB-8205 Instruções de Operação Página 401

Comentários a estes Manuais