5 nines | Article about 5 nines by The Free Dictionary
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five ninesRefers to 99.999% uptime that many network providers are fond of stating as the reliability of their networks. Whether five nines is truly what is delivered at all times may be debatable. In any event, five nines means that everything in the datacenter is fully redundant, including AC power, air conditioning, network equipment and computer hardware. See failover and redundancy.