Fujitsu MAA3182FC Series, Manual

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C141-E054-02EN 5 - 12
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Since the command stack feature exists (see Section 1.4), even if the IDD accepts a
command normally, if a command issued by another INIT is being 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.
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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 5.3 the classifications of error information displayed in the sense data are shown
and in Table 5.4, 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.