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Diagnostics and Maintenance
The INIT should issue the REQUEST SENSE command when the CHECK CONDITION status
is posted. The sense data collected by the REQUEST SENSE command indicates the detail
information of the error detected in the self-diagnostics.
The IDD status after the CHECK CONDITION status is posted differs according to the type of
the detected error.
a)
When an error is detected in the seek or write/read test, the subsequent command can be
accepted correctly. When the command other than the REQUEST SENSE and NO
OPERATION is issued from the same INIT, the error information (sense data) is cleared.
b)
When an error is detected in the hardware function test, the IDD posts the CHECK
CONDITION status for all I/O operation request except the REQUEST SENSE command.
The error status is not cleared and the IDD continues sending the Fault LED Out signal to
the interface connector even if the error information (sense data) is read. Only when the
loop is reset, the BUS DEVICE RESET message is issued or the power is turned off or re-
turned on, the status can be cleared. When this status is cleared, the IDD executes the initial
self-diagnostics again (see item (1)).
Refer to Chapter 3 of Fibre Channel Interface Specifications for further details of the command
specifications.
Data loss
When the SEND DIAGNOSTIC command terminates with the CHECK
CONDITION status, the INIT must collect the error information using
the REQUEST SENSE command. The RECEIVE DIAGNOSTIC
RESULTS command cannot read out the error information detected in
the self-diagnostics.
6.1.2
Test programs
The basic operations of the IDD itself can be checked with the self-diagnostic function. However, to
check general operations such as the host system and interface operations in a status similar to the
normal operation status, a test program that runs on the host system must be used.
The structure and functions of the test program depend on the user system requirements. Generally,
it is recommended to provide a general input/output test program that includes SCSI devices
connected to the loop and input/output devices on other I/O ports.
Including the following test items in the test program is recommended to test the IDD functions
generally.
6-4
CAUTION
C141-E133-02EN
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Troubleshooting
