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
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 even if the error information (sense data) is read. Only when the power is turned off or
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
6.1.2Test programs
The basic operations of the IDD itself can be checked with the
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 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.
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