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This is an important question, as reliability is one measurement for a RAID array that customers look at when making a purchasing decision. There are several reliability measurements to look at.
It is best to test the leading vendors' equipment looking at the areas that you want to maintain availability, including the physical space and the personnel involved.
I have found firsthand that most outages in the storage space are not caused by the physical storage devices themselves, rather from the interaction of the management team and the applications within the environment.
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