	US 7,519,046 B2
	Access path management method and program
Tomohiko Suzuki, Odawara (Japan); and Kyosuke Achiwa, Yamato (Japan)
Assigned to Hitachi, Ltd., Tokyo (Japan)
Filed on Sep. 16, 2005, as Appl. No. 11/227,492.
Claims priority of application No. 2005-207295 (JP), filed on Jul. 15, 2005.
Prior Publication US 2007/0016681 A1, Jan. 18, 2007
Int. Cl. H04L 12/28 (2006.01)

U.S. Cl. 370—351 [709/224; 709/227]

9 Claims

5. An access path management method for a system in which a host computer and a storage system are connected via at least one intermediate device to enable communication, wherein said storage system comprises a storage device capable of data storage, wherein said host recognizes a logical path from said host computer to said storage device, said access path management method comprising the steps of:

specifying a plurality of physical paths which exist between said host computer and said storage system;

specifying to which physical path of said specified plurality of physical paths said logical path corresponds; and

making said logical path correspond to said specified physical path,

wherein each intermediate device comprises a plurality of intermediate ports, which are ports to be connected to said host, said storage system or another intermediate device,

wherein said host computer comprises a host port, which is a port to be connected to an intermediate device, and a storage resource capable of storing said logical path,

wherein said storage system comprises a storage port, which is a port to be connected to an intermediate device,

wherein said logical path is represented by a host/storage port identifier (ID) for specifying at least one from among said host port and said storage port, and a storage device ID for specifying said storage device,

wherein said physical path is expressed by a host port ID for specifying said host port, an intermediate port ID for specifying said intermediate port, and a storage port ID for specifying said storage port, and

wherein said logical path specifies a physical path to which said logical path corresponds, by specifying, from among said plurality of physical paths, a physical path comprising either a storage ID or a host port ID which conforms to a host/storage port ID contained in said logical path.