Ultra Start 450 SERIES Instruction Manual download pdf (Page 68)

48 Ultra Enterprise 450 Server Owner’s Guide • July 1997

For more information about power supplies, redundancy, and configuration rules,

see “About Power Supplies” on page 64.

Hot-Swappable Power Supplies

Power supplies in a redundant configuration feature a “hot swap” capability. You

can remove and replace a faulty power supply without turning off the system power

or even shutting down the operating system. The power supplies are easily accessed

from the rear of the system, without the need to remove system covers.

Automatic System Recovery (ASR)

The system provides for automatic system recovery from the following types

of hardware component failures:

■ CPU modules

■ Memory modules

■ PCI buses

■ System I/O interfaces

The automatic system recovery (ASR) feature allows the system to resume operation

after experiencing certain hardware faults or failures. Automatic self-test features

enable the system to detect failed hardware components and an auto-configuring

capability designed into the system’s boot firmware allows the system to

deconfigure failed components and restore system operation. As long as the system

is capable of operating without the failed component, the ASR features will enable

the system to reboot automatically, without operator intervention.

During the power-on sequence, if a faulty component is detected, the component is

effectively disabled and if the system remains capable of functioning, the boot

sequence continues. In a running system, some types of failures (such as a processor

failure) will usually bring the system down. If this happens, the ASR functionality

enables the system to reboot immediately if it is possible for the system to function

without the failed component. This prevents a faulty hardware component from

keeping the entire system down or causing the system to crash again.

Control over the system’s ASR functionality is provided by a number of OpenBoot

PROM commands. These are described in the document Platform Notes: Sun

Ultra 450 Workstation and Ultra Enterprise 450 Server, available on the Solaris on Sun

Hardware AnswerBook. This AnswerBook documentation is provided on the SMCC

Updates CD for the Solaris release you are running.

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Ultra Start 450 SERIES Instruction Manual Page 68