Disk control system and control method of disk control system

• US 20050246490A1
• Filed: 07/07/2005
• Published: 11/03/2005
• Est. Priority Date: 02/04/2003
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Tabuchi, Hideo, Nakamura, Yasuaki, Shimada, Akinobu
• Granted Patent: US 7,127,583 B2
• Time in Patent Office: Days
• US Class Current: 711/114
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0631 by allocating resources to storage systems
• CPC Class Codes: G06F 3/0644 Management of space entities, e.g. partitions, extents, pools
• CPC Class Codes: G06F 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

In order to assign logical devices efficiently to logical units, 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 a logical device corresponding to a logical unit specified by that process command, includes means for managing logical devices, which are logical storage regions that have been set in a storage region provided by a disk drive, means for storing a correspondence between logical units, which are storage regions that have been set logically, and the logical devices, and means for assigning, when a process command has been received for a logical unit to which no logical device has been assigned, a logical device to that logical unit and performing processing with regard to that logical device.

Claims

1. 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 a logical device corresponding to a logical unit specified by that process command, comprising:

means for managing, as units, logical devices, which are logical storage regions that have been set in a storage region provided by a disk drive;

means for storing a correspondence between said logical devices and logical units, which are storage regions that have been set logically;

means for assigning, when a process command has been received for a logical unit to which no logical device has been assigned, a logical device to that logical unit and performing processing with regard to that logical device; and

means for responding to said information processing device, when a process command that does not cause a process with regard to a logical device has been received from said information processing device, by performing a process corresponding to that process command without performing said assignment.

2. 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, which are 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:

a first step of receiving a process command for a logical unit to which no logical device has been assigned;

a second step of assigning to that logical unit a logical device, when in said first step a process command has been received for a logical unit to which no logical device has been assigned; and

a third step of performing said process command with regard to the logical device that has been assigned in said second step.