Patent ID: 8631282
Filing Date: 2014-01-14
Classification: G06F

Abstract:
1. A storage system, comprising: a plurality of storage devices; first and second controllers coupled to a host and to each other; a first communication path, which is a path for communication according to a SAS, and which is coupled to the first controller and to the plurality of storage devices; and a second communication path, which is a path for communication according to the SAS, and which is coupled to the second controller and to the plurality of storage devices, wherein each of the communication paths has a plurality of expanders coupled serially, a highest-order expander of the plurality of expanders is coupled to the controllers, and the plurality of storage devices are coupled to one or more of the plurality of expanders, each expander is coupled to a switch device for switching whether to bypass the expander or not with regard to each of the communication paths, an actual connection destination of any of the plurality of switch devices that bypasses an expander is a switch device in an upper-level and/or a lower-level, and wherein an actual connection destination of any of the plurality of switch devices that does not bypass an expander is the expander, wherein wherein