Disk control system and control method of disk control system

A control method for a disk control system that manages, logical devices, which are logical storage regions that have been set in a storage region provided by a disk drive, that stores a correspondence between said logical devices and a plurality of logical units, said logical units being storage regions that have been set logically, that receives a process command that has been sent from an information processing device, and that performs processing with regard to a logical device corresponding to the logical unit specified by said process command, the control method comprising:

• a first step of receiving a first process command for a first logical unit;
• a second step of determining whether a first logical device has been assigned to said first logical unit;
• and
• if in said second step a first logical device is assigned to said first logical unit, a third step of performing with regard to said first logical device said first process command, and, if in said second step no logical device is assigned to said first logical unit and said first process command causes an input/output process with regard to said first logical device, then assigning a logical device to said first logical unit and performing with regard to said first logical device said first process command;
• a fourth step of receiving a second process command for a second logical unit;
• a fifth step of determining whether a second logical device has been assigned to said second logical unit;
• and
• if no logical device has been assigned to said second logical unit and said second process command is a command that does not cause an input/output process with regard to second said logical device, then performing second process command without assigning a logical device to said second logical unit.

A control method for a disk control system that manages, as units, logical devices, which are logical storage regions that have been set in a storage region provided by a disk drive, that stores a correspondence between said logical devices and logical units, said logical units being storage regions that have been set logically, that receives a process command that has been sent from an information processing device, and that performs processing with respect to a logical device corresponding to the logical unit specified by that process command, the control method comprising, when a process command has been received for a logical unit:

• if said logical device has been assigned to said logical unit, then performing with regard to said logical device a process corresponding to said process command;
• if no logical device has been assigned to said logical unit and said process command is a command that does not cause a process with regard to said logical device, then performing a process corresponding to said process command without assigning a logical device to said logical unit;
• and
• if no logical device has been assigned to said logical unit and said process command is a command that causes a process with regard to said logical device, then assigning a logical device to said logical unit and performing with regard to said logical device a process corresponding to said process command.