The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 2010
Filed:
Apr. 22, 2009
Akiyoshi Hashimoto, Kawasaki, JP;
Yasutomo Yamamoto, Sagamihara, JP;
Akira Fujibayashi, Sagamihara, JP;
Akiyoshi Hashimoto, Kawasaki, JP;
Yasutomo Yamamoto, Sagamihara, JP;
Akira Fujibayashi, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage system connected to a terminal, the computer system includes: a plurality of drive devices that respectively drive a plurality of physical disks each having a physical storage area; a RAID configuration unit that configures a plurality of RAID groups by grouping two or more of the plurality of physical disks; a logical disk creation unit that creates, for the terminal through the RAID group, a logical disk having a logical storage area associated with the physical storage area; a memory for storing a RAID group control table showing, for each the RAID group, (i) a free capacity that is the amount of physical storage area remaining in the RAID group to be able to be associated with the logical disk and (ii) a power status of the RAID group; a receiver that receives a request for creating a new logical disk; and an area allocation unit that allocates to the new logical disk the physical storage area remaining in the RAID group selected by giving priority to a RAID group in a powered state over a RAID group in a non-powered state with reference to the RAID group control table.