Patent ID: 6725293
Filing Date: 2004-04-20
Classification: G06F,Y10S

Abstract:
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 so as to serve as a channel through which information is transferred therebetween; and storing means which is accessed in common by said control processors and which stores a logical unit number which the input/output requests are assigned to, and to be processed by said control processors, wherein each of said control processors comprises: monitoring means for monitoring operating status of the other control processors, and takeover means which, if a stopped state of any other control processor is detected, updates said logical unit numbers in said storing means so that the control processor in question may take over the processing of the stopped control processor.