Exabyte EXB-8205 Betriebsanleitung PDF herunterladen (Seite 274)

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Byte 28 - Fault Symptom Code

The Fault Symptom Code (FSC) field is an Exabyte-unique byte used

to indicate the specific nature of hardware and software errors or

other events. Appendix E lists the errors indicated by the Fault

Symptom Code byte.

Note: The Fault Symptom Code field can also be used to determine

the location of errors in the data sent with LOG SELECT (4Ch)

and MODE SELECT (15h) commands. If one of the bytes sent

with the LOG SELECT or MODE SELECT command contains

an illegal value or if a reserved bit is set, the CTS returns

Check Condition status. To determine which byte contains the

error, issue a REQUEST SENSE command. The sense key will

be set to Illegal Request (5h) and the Fault Symptom Code

field will indicate which of the consecutively received bytes is

in error.

For example, if the Block Descriptor Length field (byte 03) in

the MODE SELECT Parameter List Header is invalid, the

value for the Fault Symptom Code byte would be 04h (the

CTS counts the first byte received as byte 1 not as byte 0).

Note that this use of the Fault Symptom Code byte applies to

the MODE SELECT and LOG SELECT commands only and is

not described in Appendix E.

Sense Byte Pending Status

WhentheCTSreportsCheckConditionstatusinresponsetoa

command from an initiator, the CTS retains the sense byte pending

status, including error information and Check Condition status, for

the initiator until one of the following occurs:

Error information is reset by the next command execution that is

not an INQUIRY or REQUEST SENSE command for the same

initiator.

Error information is reset by a power-on reset, a Bus Device Reset

message, or a SCSI bus reset condition.

18-12

EXB-8205 and EXB-8505

(Standard and XL)

510503

18 REQUEST SENSE (03h)

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