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Chapter 3. Troubleshooting
This chapter provides basic troubleshooting information to help you resolve some
common problems that might occur with your IBM NAS 300.
Note: The information is organized by IBM NAS 300 component (engines, Fibre
Troubleshooting the engines
Diagnostic tools overview
The following tools are available to help you identify and resolve hardware-related
problems:
v POST beep codes, error messages, and error logs
v Diagnostic programs and error messages
v Light path diagnostics
Identifying problems using LEDs
Each engine has LEDs to help you identify problems with some engine
components. These LEDs are part of the light path diagnostics built into the engine.
By following the path of lights, you can identify the type of system error that
occurred. See the following sections for more information.
Power supply LEDs
The ac and dc Power LEDs on the power supply provide status information about
the power supply. See "Power supply LED errors" on page 52.
Light path diagnostics
You can use the light path diagnostics to quickly identify the type of system error
that occurred. The diagnostics panel is under the "wind tunnel." Each engine is
designed so that any LEDs that are On, remain On when the engine shuts down as
long as the ac power source is good and the power supplies can supply +5V dc
current to the engine. This feature helps isolate the problem if an error causes the
engine to shut down. See "Light path diagnostics table" on page 16.
© Copyright IBM Corp. 2001
Channel hub, and so on); however, if a Fibre Channel hub or one or more
engines, RAID storage controllers, or storage units loses power to one power
supply, check the circuit breakers on the power distribution units (PDUs)
located inside the IBM NAS 300 left and right side covers.
The power-on self-test (POST) generates beep codes and messages to indicate
successful test completion or the detection of a problem. See "POST" on page 16
for more information.
The diagnostic programs are stored in upgradable read-only memory (ROM) on
the system board. These programs are the primary method of testing the major
components of your engine. See "Diagnostic programs and error messages" on
page 17 for more information.
Note: To view error messages, attach a monitor, keyboard, and mouse to the
each engine before it is powered-on.
Light-emitting diodes (LEDs) help you identify problems with engine components.
These LEDs are part of the light-path diagnostics that are built into your engine.
By following the path of lights, you can quickly identify the type of system error
that occurred. See "Light path diagnostics" for more information.
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Table of Contents
Troubleshooting
