24 x 7 business operations and the need for an “always-on” computing infrastructure means that there is no time for downtime in business-critical and mission-critical applications. Customers are no longer just relying on simple server reliability, with downtime of up to 9 hours a year; they are demanding more uptime, challenging server suppliers to provide highly reliable systems at much lower price-points than ever before.
Fault Tolerant servers surpass the concept of high availability to enter the era of the "continuous availability". Such servers are designed to guarantee an availability of 99.999%, that is to say on average less than 5 minutes of unplanned interruption per year, including time necessary for repairs, updates, and general maintenance.
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