Patent attributes
Provided is a load balancing system and method capable of balancing the load of an apparatus employing both the internal mirror copying function and external connection function. With this load balancing system and method for balancing the load of a first apparatus equipped with a first function that copies data of one logical device to another logical device paired among the logical devices set in itself, and a second function that virtualizes an external logical device and provides it to a host system, the first and second apparatuses are controlled for periodically detecting the load of the first apparatus, and the load of a second apparatus provided separately from the first apparatus and equipped with the first and second functions, respectively, and migrating the logical device that is not paired with the other logical device among the logical devices set in the first apparatus to the second apparatus when the load of the first apparatus is greater than the load of the second apparatus.
