COMPUTER SYSTEM, STORAGE SYSTEM AND METHOD FOR EXTENDING VOLUME CAPACITY

• US 20090300285A1
• Filed: 08/10/2009
• Published: 12/03/2009
• Est. Priority Date: 09/02/2005
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamamoto, Masayuki, Nagai, Takayuki, Asano, Masayasu
• Granted Patent: US 8,082,394 B2
• Time in Patent Office: Days
• US Class Current: 711/114
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

The object of the present invention is to prevent distribution of a storage range to a volume from an inappropriate disk drive comparing with use of the volume as a result of an automatic extension of a volume capacity. A computer system has a storage system including a physical storage device, a host computer, and a management computer. The storage system includes a plurality of kinds of physical storage devices physically dividing into two segments or more the volume and records as constitution information the correspondence between each segment and the volume using the segment. And the storage system records the kind of physical storage device to be allocated to the volume and selects the physical storage device according to the kind of stored physical storage device for allocation of the segment when the host computer performs an I/O access to the volume.

Claims

1. A storage system comprising:

a plurality of first storage regions including at least one first type of drive;

a plurality of second storage regions including at least one second type of drive which is a different type drive from said at least one first type of drive; and

a processor providing a logical volume which is accessed from a computer and controlling mapping information regarding said logical volume and said plurality of first storage regions and said plurality of second storage regions,

wherein at least one portion of said logical volume is allocated to at least one first storage region,

wherein, based on an access state of said logical volume, said processor copies data in said at least first storage region, from said at least one first storage region to at least one second storage region which is not allocated, and

wherein said processor changes said mapping information concerning said copied data from said at least one first storage region to at least one second storage region which is not allocated.