Ever since the dawn of time the storage administrators have been indoctrinated with redundancy. You have to have everything at least twice in order to maintain uptime and be able to achieve this to a level of around 99,999%. This is true in many occasions however there are exceptions when even dual fabrics (ie physically separated) share components like hosts, arrays or tapes.. If a physical issue in one fabric is impacting that shared component the performance and host IO may even impact totally unrelated equipment on another fabric and spin out of control.
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