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4.2.3
Error Logging
In order to collect information that is effective in maintenance, it is desirable for the INIT to
accumulate (log) error information related to the SCSI bus which it has detected itself (BUS
FREE errors, command completion wait time-out, etc.) and error information reported by the
IDD.
By specifying "1" in the PER bit in the "Read/Write Error Recovery parameter (Page 1) and
the "Verify Error Recovery parameter (Page 7) of the MODE SELECT or MODE SELECT
EXTENDED command, the INIT can know of the occurrence of errors which were recovered
from successfully by the IDD's internal error recovery processing and their contents. By
logging that error information, the INIT can obtain data for more detailed analysis of the disk
drive's operating condition.
Concerning the contents of the error log, it is recommended that the data have a time stamp
affixed so that they can be edited in a time series of the times the errors were detected, and that
they include the following information.
•
The source which issued the command and the SCSI ID of the SCSI device which was the
target of the command.
•
The CDB which was issued.
•
The receiving status, or, when the status was that the command could not be received, the
code showing the type of error detected by the INIT and its content.
•
All bytes reported by the IDD.
C141-E039-01EN
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