Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 89

Certain system components have built-in LEDs that can alert you when that
component requires replacement. For detailed instructions, see "How to Isolate
Faults Using LEDs" on page 62.
2. Does the system boot?
If the system cannot boot, you have to run firmware-based diagnostics that do not
depend on the operating system.
If the system can boot, you should use a more comprehensive tool. The typical
fault isolation process is illustrated in
3. Do you intend to run the tests remotely?
Both Sun Management Center and ALOM system controller software enable you
to run tests from a remote server. In addition, ALOM provides a means of
redirecting system console output, allowing you to remotely view and run
tests—like POST diagnostics—that usually require physical proximity to the serial
port on the server's back panel.
SunVTS software, a system exercising tool, also enables you to run tests remotely
using either the product's graphical interface, or tty-mode via remote log in or
Telnet session.
4. Will the tool test the suspected source(s) of the problem?
Perhaps you already have some idea of what the problem is. If so, you want to
use a diagnostic tool capable of testing the suspected problem sources.
tells you which replaceable hardware parts can be isolated by each fault
TABLE 2-4
isolating tool.
tells you which replaceable hardware parts are covered by each system
TABLE 2-9
exercising tool.
5. Is the problem intermittent or software-related?
If a problem is not caused by a clearly defective hardware component, then you
may want to use a system exerciser tool rather than a fault isolation tool. See
Chapter 2 for instructions and "About Exercising the System" on page 39 for
background information.
).
FIGURE 3-1
Chapter 3 Isolating Failed Parts 71