Patent ID: 7069405

Claim:
A disk control system that receives a process command for writing or reading of data from an information processing device, and performs a write or read process of data with respect to one or more logical devices corresponding to a logical unit specified by said process command, comprising: means for managing at least one logical device, said at least one logical device being a logical storage region that has been set in a storage region provided by a disk drive; means for storing a correspondence between said at least one logical device and at least one logical unit, said at least one logical unit being a storage region that has been set logically; means for assigning, when a first process command has been received for a first logical unit to which no logical device has been assigned and said first process command requires performing a process with a logical device, a first logical device to said first logical unit and for performing processing with regard to said first logical device; and means for responding to said information processing device, when a second process command that does not cause an input/output process with regard to a second logical device has been received from said information processing device, by performing said second process command without performing said logical device assignment.