Patent ID: 7554910
Filing Date: 2009-06-30
Classification: H04L

Abstract:
1. A method for managing an access path in a storage network system that forms multiple paths between a large-capacity data storage device and a host computer that employs the data storage device, and transfers data by means of a selected path, the method comprising: selecting a second access path that can be used as a replacement of a first access path that is currently in use to connect the data storage device and the host computer, wherein the second access path is selected in advance of a defect on the first access path; calculating a quantity of traffic on the first access path which is associated with a device disposed on the first access path; calculating a variation of the quantity of traffic on the second access path which is associated with a device disposed on the second access path taking the calculated quantity of traffic on the first access path into consideration; determining whether the device on the second access path causes a bottleneck or not, according to the calculated value of the variation of traffic on the second access path; and outputting a determination result, wherein a value of the quantity of traffic on the first access path is reduced, and the reduced value is added to the quantity of traffic associated with the device on the second access path, to calculate the variation of the quantity of traffic in the respective devices on the second access path.