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5.2 INIT Error Recovery Methods (Recommended)
C141-E167 5 - 21
Table 5.4 Error recovery processing procedures (5 of 5)
Recovery
method
Recovery processing procedure
26 1) Issue the LOG SENSE command and read the "Current" values of the LOG SELECT
parameters.
2) Search for any parameter values which exceed the threshold value or have reached the
maximum value, then issue the LOG SELECT command from the INIT and perform
resetting.
3) Reissue the original command.
27 1) Issue the INQUIRY command and read the operation mode information.
2) If the parameter values are appropriate, reissue the original command.
Note This error could also be caused by a UNIT ATTENTION condition being generated,
caused by a programming error of another INIT, so when the values in the parameters
read in ( are illegal, recovery method 2 should be performed, or the operations of the
other INITs should be confirmed.
5.2.3 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
error, 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.