Compaq ProLiant 1200 Manual page 4

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