How to Isolate Failed Components

The following sections describe how to isolate failed components using RSC, POST, OpenBoot Diagnostics, and how to use a second Sun server to diagnose problems.

How to Use Default NVRAM Parameters

During the boot process, if you lose access to the system console due to a failed nonvolatile random access memory (NVRAM) configuration change, use the Safe NVRAM mode to regain access to the console. This function replaces the Stop-N (Stop-shift-n) keyboard sequence that is not supported from the keyboard in the Sun Fire 280R server.

What to Do

To reset the NVRAM parameters to a known recovery mode, perform the following steps:

1.Power-on the system.

2.Watch the wrench LED for rapid flashing during the boot process. The amber wrench LED flashes for approximately three seconds.

3.While the wrench LED is flashing, press the Power button twice in quick succession.

The following output appears after the system boots to the ok prompt.

Safe NVRAM mode, the following nvram configuration variables have been overridden:

’diag-switch?’ is true ’use-nvramrc?’ is false

’input-device’, ’output-device’ are defaulted ’ttya-mode’, ’ttyb-mode’ are defaulted

These changes are temporary and the original values will be restored after the next hardware or software reset.

Sun Microsystems 280R manual How to Isolate Failed Components, How to Use Default Nvram Parameters

Models: 280R