How To Use Post Diagnostics - Sun Microsystems Enterprise 250 Owner's Manual

How to Use POST Diagnostics

When you turn on the system power, POST diagnostics run automatically if any of
the following conditions apply:
The OpenBoot PROM variable diag-switch? is set to true when you power on
the system.
You hold down the keyboard's Stop and D keys as you power on the system.
You power on the system by turning the front panel keyswitch to the Diagnostics
position ( ).
In the event of an automatic system reset, POST diagnostics run under either of the
following conditions:
The diag-switch? variable is set to true and the diag-trigger variable is set
to error-reset or soft-reset.
The front panel keyswitch is in the Diagnostics position (
diag-trigger variable is set to error-reset or soft-reset.
For information about the various keyswitch positions, see "About the Status and
Control Panel" on page 8.
Before You Begin
You can choose to view POST diagnostic and error messages locally on an attached
terminal or remotely on an RSC console.
To view POST diagnostic messages on the local system, you need to connect an
alphanumeric terminal or establish a tip connection to another Sun system.
For more information, see "About Setting Up a Console" on page 19.
To view POST diagnostic messages remotely on an RSC console, you need to
configure the RSC software before starting POST. For information about using the
RSC software, see the Remote System Control (RSC) User's Guide.
Note – By default, POST output is displayed locally on an attached terminal or
through a tip connection. If your server has been reconfigured to display POST
output on an RSC console, POST results will not display locally. To redirect POST
output to the local system, you must issue the OpenBoot PROM command
diag-output-to ttya from the RSC console. See the Remote System Control (RSC)
User's Guide for additional details.
Chapter 11 Diagnostics and Troubleshooting
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