Datasheet

Sense Data and Error Recovery Methods
5-16 C141-C008
executed, or if there are other commands in the stack, execution of the
command is caused to wait until all the other commands have been
processed. The execution wait time is dependent upon the type of command
issued by the other INITs and the contents of its specifications.
• If the IDD has executed error recovery processing (retried) for an error that
occurred on the FC bus or in the disk drive, command completion time will
be longer than normal.
(4) Loop error
This error occurs in the case that the FC Loop enters the initialization at a time
when the INIT is not expecting it, during execution of a command on the FC
Loop. Even in cases where a Lip is generated by another FC device on the bus,
the same state occurs, but the occurrence of an unexpected Loop initialize should
be processed as an abnormal state of the system.
The cause of this error is the occurrence of an unrecoverable error on the FC
Loop, the occurrence of a serious protocol error, etc. When this error is detected,
the INIT should issue the REQUEST SENSE command and gather sense data
then judge the error recovery method according to the contents of the sense data
or system information.
5.2.2 Sense data analysis and error recovery methods
The INIT can judge the procedure for error recovery by analyzing the contents of
the sense data. Table 5.5 the classifications of error information displayed in the
sense data are shown and in Table 5.6, the procedures for error recovery
recommended for the INIT to execute are shown. The error recovery procedure
which can be executed by the INIT will differ depending on the system's
condition, so the optimum processing procedure should be selected for the user
system with reference to the following descriptions.