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M2266S/H
Technical Handbook
If commands received from the SCSI bus are being executed or stacked
before the diagnostic mode is set, the self-diagnostics are stared after all
command execution is terminated.
While the diagnostic mode is set, the self-diagnostics are repeated in the
following sequence: hardware function test, seek test, write/read test, as
long as the error is undetected. While the diagnostic mode is set, the IDD
does not reply to the SCSI bus.
Online Self-Diagnostics (SEND DIAGNOSTIC Command)
The INIT can make the IDD execute self-diagnostics by issuing the SEND
DIAGNOSTIC command.
The INIT specifies the execution of self diagnostics by setting 1 for the
Selftest bit on the CDB in the SEND DIAGNOSTIC command and specifies
the test contents with the Unitoff bit.
When the specified self-diagnostics end normally, the IDD posts GOOD
status.
When an error is detected by the self-diagnostics, the IDD terminates the
SEND DIAGNOSTIC command with the CHECK CONDITION status. At
this time, only when an error is detected in the hardware function test, the
LED on the front panel of the disk drive blinks.
Test Programs
The self-diagnostics check the basic operations of the IDD itself. 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 that you provide a general
input/output test program that includes SCSI devices connected to the SCSI
bus and input/output devices on other I/O ports.
To test the IDD functions generally, include the following tests:
• Interface (SCSI Bus) Test
• Basic Operation Test
• Random/Sequential Read Test
• Write/Read Test
6-4
FS810125-01 . . . A
Fujitsu America, Inc.
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