Patent ID: 7302498
Filing Date: 2007-11-27
Classification: G06F

Abstract:
1. A disk control unit for controlling a magnetic disk which stores data from a computer comprising: a front end I/F which is an interface to the computer; a back end I/F which is an interface to the magnetic disk; a processor for controlling each section; and a main memory section, wherein the front end I/F and the back end I/F exchange information with a plurality of internet small computer system interface (iSCSI) devices via a network connected between the iSCSI devices and the front end and back end I/Fs, wherein each of the iSCSI devices manages a storage, wherein the main memory section stores registered information expressing an attribution of each of the iSCSI devices including capacity information indicating a capacity of the storage of each iSCSI device, access information indicating security and performance of each of the iSCSI devices through the network, and ranking information assigning a rank to each of the iSCSI devices based on the registered information and the access information, wherein the processor selects an appropriate iSCSI device according to various types of information including the ranking information stored in the main memory section based on a condition as requested by the computer, wherein said capacity information of the storage of each iSCSI device is collected during; SCSI login processing to said iSCSI devices, and wherein said access information indicating security and performance of each of the iSCSI devices is collected at a timing of performing a test access to said iSCSI devices.