10-2 Sun Fire V120 and Netra 120 Server User’s Guide • December 2001
10.1 Introduction to the POST, obdiag, andSunVTS Diagnostic Tools
The following diagnostic tools are available for the Sun Fire V120 and Netra 120
servers:
■Power On Self Test(POST) Diagnostics
■OpenBoot Diagnostics (obdiag)
■SunVTS
If you need to contact Sun to report a problem with your system, it will help the
engineers to resolve the problem if you can providerelevant diagnostic information
from these tools.

10.1.1 Using POST Diagnostics

Toview Power On Self Test (POST) diagnostic and error messages you need to have
a serial connection set up to the server.For more information, see “Setting Up Serial
Connections” on page 6-4.
If your system has the OpenBoot PROM (OBP) variable diag-switch? set to true,
then POST diagnostics will run automatically when you power on the server.
However,the default setting for diag-switch? is false.
Tostart POST diagnostics, at the ok prompt, do the following:
1. Type:
2. Type:
where value is either min or max (depending on the quantity of diagnostic
information you want to see).
3. Type:
ok setenv diag-switch? true
ok setenv diag-level value
ok reset-all