High Availability system: Overview
QNX SDP8.0High Availability Framework Developer's GuideDeveloper
The ideal High Availability (HA) system is one that remains
up and running continuously, uninterrupted for an
indefinite period of time. In practical terms, HA systems
strive for five nines
availability, a metric
referring to the percentage of uptime a system can sustain
in a year; 99.999% uptime amounts to about five
minutes downtime per year.
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