IBM TotalStorage NAS Gateway 500, Руководство по обслуживанию

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MAP 1542: I/O Problem Isolation
This MAP is used to locate defective FRUs not found by normal diagnostics. For this procedure,
diagnostics are run on a minimally configured system. If a failure is detected on the minimally configured
system, the remaining FRUs are exchanged one at a time until the failing FRU is identified. If a failure is
not detected, FRUs are added back until the failure occurs. The failure is then isolated to the failing FRU.
This I/O problem-determination MAP isolates I/O card and I/O subsystem failures. When I/O problem
isolation is complete, all cables and cards exhibiting a failure will have been replaced or reseated.
Notes:
1. This MAP assumes that a Diagnostics CD-ROM is available.
2. If a general-access password or privileged-access password is installed, you are prompted to enter the
password before the diagnostic CD-ROM can load.
3. The term POST indicators refers to the device mnemonics (words memory , keyboard , network ,
SCSI , and speaker ) that appear on the system console during the power-on self-test (POST).
4. The service processor might have recorded one or more symptoms in its error log. It is a good idea to
examine that error log before proceeding. (See “Accessing system error logs” on page 36.)
5. The service processor might have been set by the user to monitor system operations and to attempt
recoveries. You can disable these actions while you diagnose and service the system. If you disable
them, make notes of their current settings so that you can restore them easily. The following table lists
the settings:
Surveillance From the service processor Setup Menu, go to the
Surveillance Setup Menu and disable surveillance.
Unattended start From the service processor System Power Control Menu,
disable unattended start mode.
Reboot policy From the System Power Control Menu, go to the
Reboot/Restart Policy Setup Menu and set:
a. Number of reboot attempts to
0 (zero).
b. Use OS-Defined restart policy to No.
c. Enable supplemental restart policy to No .
Call out From the Call-In/Call-Out Setup Menu, go to the Serial
Port Selection Menu and disable call-out on serial port
S2.
The steps in this procedure will attempt to slow boot the system into service mode diagnostics. The
following procedure describes booting a system with an attached console.The following procedure requires
booting standalone diagnostics (5 key between the
keyboard and speaker indicators).
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NAS Gateway 500 Service Guide