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N+1 Definition and Example

N+1 redundancy is a term that ensures system availability in the event of component failure. In this example, we are referring to a Datacenter environment where the components (N) have at least one independent backup component (+1). N+1 redundancy recognizes that only a small part of any infrastructure system has any chance of failing at once. 2N redundancy completely duplicates the operating infrastructure. If you need 2 generators for backup, you buy 4 generators. If you need 4 cooling units, you buy 8. N+1 redundancy recognizes that only a small part of any infrastructure system has any chance of failing at once. Odds are vanishingly small that you’re going to have 4 cooling units all fail at the same time. For N+1, you consider what are the odds of having more than 1 unit fail, the odds of having another unit fail before you can get the first failure repaired, and the potential impact.

If there is a small chance of 2 generators failing at the same time then go with N+1 while if there is a high probability of 2 generators failing at once then go with 2N. If not needed a 2N, while nice to have in place, would be a waste of time and money which is passed along to customers, goes against a green facility (if operating), or could be used elswhere in your operating budget. If you’re set up is design so absolutely no interruption is critical, such as power, you might run N+2 with 1 spare hot and the other 1 cold. To learn more about our experience with datacenter redundancy and N+1 and 2N cofiguration please visit http://www.globalcoloquote.com or email us at woody@globalcoloquote.com.



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