Patent ID: 7917551
Filing Date: 2011-03-29
Classification: G06F

Abstract:
1. A storage system having one or more storage controllers for forming a plurality of logical volumes in a storage area of a physical device for storing a plurality of contents provided from a host system, wherein said one or more storage controllers comprise: a nearline volume for storing contents among said plurality of logical volumes with a low access count from said host system, wherein said nearline volume comprises a snapshot folder for storing, as needed, information of said group folder at an arbitrary point in time; wherein information concerning said group folder with a low access frequency from said host system is preferentially selected and stored among information of a plurality of said group folders stored in said snapshot folder; a folder configuration unit for configuring a plurality of folders to store said plurality of contents in said plurality of logical volumes; a core-contents management unit for specifying and managing core-contents to become the core from said plurality of contents to be stored in said plurality of logical volumes or said plurality of folders; a related contents management unit for managing said core-contents and one or more related contents associated with a part or the whole of said core-contents from a plurality of contents to be stored in said plurality of logical volumes or said plurality of folders; and a group folder configuration unit for configuring a group folder that groups said core-contents and said related contents across said plurality of logical volumes or said plurality of folders.