Patent ID: 7873759

Claim:
An information processing system that communicates with a storage apparatus through a plurality of paths P i (i=1 to n, where n is a total number of the paths), and issues an I/o to the storage apparatus through one of the paths P i , the information processing system comprising: a first processing unit that sets weights W i to the respective paths P i ; a second processing unit that obtains an I/O issue interval d i by dividing a sum total ΣW i of the weights W i by the weight W i set to the respective paths P i ; a third processing unit that obtains I/O issue timings t i (m)of each of the paths P i from the following equation: t i ( m )= d i /C+m·d i ( m= 0, 1, 2, . . . ) (where C is a constant); and a fourth processing unit that issues the I/Os to the paths P i in an order corresponding to an order of the I/O issue timings t i (m) chronologically arranged.