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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