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WWNs are important when setting up a storage area network (SAN). Each device has to be registered with the SAN by its WWN before the SAN will recognize it. (In fact, if the SAN has trouble recognizing a device, the WWN registration is usually one of the first things an administrator will check.) The names are usually 128 binary digits (bits) long, but could be 64 bits if the device is older.
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