Compaq ProLiant 2000 Eliminating Single Points of Failure and Enabling Rapid R - Page 4

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ECG0094/1197 Eliminating Single Points of Failure (cont.) ... 0-3 seconds

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7
%
Eliminating Single Points of Failure (cont.)
ECG0094/1197
0-3
seconds
29%
<3 hours
34%
<3 minutes
37%
$FFHSWDEOH
’RZQWLPH
Source:
The Standish Group
International, Inc
Figure 2: Acceptable downtime is measured in increasingly smaller increments.
This technology brief examines some of the fault tolerance, fault prevention, and rapid recovery
measures Compaq has implemented to date. It begins with Pre-Failure Monitoring and Warranty,
then moves through the server subsystems to provide an overview of the technologies implemented
within the server to eliminate single points of failure and enable rapid recovery, bringing higher
reliability to Compaq customers.
S
ERVER
S
UBSYSTEMS
Compaq continues to develop and implement technological advances that improve the reliability of
server subsystems. Currently available technologies are described below, with references to other
white papers for further detail, where applicable.
Processor
Without the Compaq approach to improved reliability, the server would come to an abrupt halt if a
processor were to fail. To avoid this potential catastrophe, Compaq starts with top-quality
components, then implements a number of redundancy schemes and addresses other factors that can
cause processor failure, such as high temperature or an unstable power supply. These safeguards
help ensure that fault prevention, fault tolerance, and rapid recovery goals are met.
The Off-Line Backup Processor option, available on the Compaq ProLiant 5000, 6000, 6500, and
7000 (as well as older ProLiant 2000, 4000, and 4500 systems), minimizes downtime caused by
processor failure. The system can be configured so that if a processor fails, the system is
automatically powered down, reconfigured, and restarted from the second processor with minimal
system interruption. The Off-Line Backup Processor can also be used to provide additional
processing power during normal operation.
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