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6-4 C141-E234
When an error is detected in the self-diagnostics, the HDD terminates the SEND DIAGNOSTIC
command with the CHECK CONDITION status.
The initiator 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 HDD 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 initiator, the error information (sense data) is cleared.
b) When an error is detected in the hardware function test, the HDD 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 re-turned on, the status can be cleared. When this status is
cleared, the HDD executes the initial self-diagnostics again (see item (1)).
Refer to Subsection 4.4.1 “SEND DIAGNOSTIC (1D)” of the 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 initiator 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 HDD 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 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 HDD functions
generally.