Patent ID: 7047329
Filing Date: 2006-05-16
Classification: G06F,Y10S

Abstract:
1. A storage controller for controlling transfer of input/output data to and from a lower level apparatus in response to input/output requests received from a higher level apparatus, said storage controller comprising: a plurality of external interface controllers for receiving said input/output requests; a plurality of control processors which process said input/output requests; a loop of fibre channel interface interposed between said external interface controllers and said control processors to serve as a channel through which information is transferred therebetween; and a shared memory which is accessed in common by said control processors and which stores logical unit numbers of the input/output requests to be processed by said control processors, wherein each of said control processors counts the number of processed input/output requests, notifies the other control processors of the counted number of processed input/output requests, acquires the number of processed input/output requests from the other control processors, and updates said logical unit numbers in said shared memory so as to average the counts of processed input/output requests between said control processors.