In storage networking, the physical path between a server and the storage device that supports it can sometimes fail. When there's only one physical path between the two devices, there is a single point of failure (SPoF), which can be a problem if a cable breaks or someone accidentally unplugs the wrong cable. Because SAN multipathing establishes multiple routes between the hardware, however, if someone accidentally unplugged the wrong cable and one path failed, I/O would simply be routed through another path.
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