Map 1548: Processor Subsystem Problem Isolation - IBM TotalStorage NAS Gateway 500 Service Manual

MAP 1548: Processor Subsystem Problem Isolation

Notes:
1. Be sure to unplug the power cords before removing or installing processor cards, the PCI riser card, or
the CEC backplane to avoid damage to it.
2. This MAP assumes that a diagnostic CD-ROM is available.
3. If a power-on password or privileged-access password is installed, you are prompted to enter the
password before the diagnostic CD-ROM can load.
4. The term POST indicators refers to the device mnemonics that appear during the power-on self-test
(POST).
5. The support leg located on the bottom of the media support shelf is used to deactivate a microswitch.
The microswitch is located on the CEC backplane and when deactivated cuts off power to some of the
components and connectors located on the CEC backplane. This support shelf must be correctly
seated and secured in position after any new FRU is added to the system and you perform a system
boot.
6. The service processor might have recorded one or more symptoms in its error log.
v If you arrived here after performing a slow boot, look for a possible new error that occurred during
the slow boot. If there is a new error, and its actions call for a FRU replacement, perform those
actions. If this does not resolve the problem, go to "Step 1548-1" on page 78.
v If an additional slow boot has not been performed, or if the slow boot did not yield a new error code,
look at the error that occurred just before the original error. Perform the actions associated with that
error. If the problem is not resolved, go to "Step 1548-1" on page 78.
v If a slow boot results in the same error code, and there are no error codes before the original error
code, go to "Step 1548-1" on page 78.
Before proceeding, it is a good idea to examine that error log. (See "Accessing system error logs" on
page 36.
7. The service processor might have been set by the user to monitor system operations and to attempt
recoveries. You might want to 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 before you leave. The
following settings might be of interest to you.
Surveillance
Unattended start mode
Reboot policy
Call out
8. Verify that the system has not been set to boot to the SMS menus or to the open firmware prompt.
From the System Power Control Menu, select Boot Mode Menu. Verify that all four options are set to
disabled.
From the Service Processor Setup Menu, go to the
Surveillance Setup Menu and disable surveillance.
From the Service Processor System Power Control Menu,
disable unattended start mode.
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.
From the Call-In/Call-Out Setup Menu, go to the Serial
Port Selection Menu and disable call-out on serial port
S2.
Chapter 3. Maintenance Analysis Procedures (MAPs)
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