NonStop S-Series Planning and Configuration Guide (G06.29+)

Planning for System Availability and Support
HP NonStop S-Series Planning and Configuration Guide—523303-021
10-6
Minimizing Unplanned Outage Minutes
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Monitoring critical objects in your system environment.
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Automating operations, intervention, recovery, and performance-monitoring tasks
and auditing your system and applications for fault tolerance.
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Creating an alternate system disk so that it is possible to recover from unexpected
difficulties in any of these problem-management procedures.
Minimizing Unplanned Outage Minutes
The following strategies can help you reduce the number of outage minutes caused by
an unplanned outage:
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Using a systematic problem-solving approach to handling problems
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Automating recovery procedures
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Preparing a disaster-recovery plan
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Reviewing, testing, and documenting problem-detection, escalation, and recovery
procedures
These and other problem-management strategies are described in detail in the
Availability Guide for Problem Management.
Power Failures
An AC power failure is one cause of unplanned outage. During an AC power failure,
the batteries in a system enclosure can power all the components in that enclosure for
a short, configurable period of time.
Power Failure Functional Description
The amount of time that the batteries can operate all the equipment in the system
enclosure at full power is called the power-fail delay time. After that amount of time
expires, the batteries switch to Low Power Mode where the batteries power the
processor memory for as long as they can, usually 45 minutes.
A system has two possible maximum power-failure delay times:
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Calculated maximum power-fail delay time: the delay time calculated by the
service processors
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Configured maximum power-fail delay time: the delay time configured by the
customer