Patent ID: 8046391
Filing Date: 2011-10-25
Classification: G06F

Abstract:
1. A storage apparatus, comprising: a storage device having a plurality of volumes configured by being separated into different groups based on processing performance as logical storage areas of data; and a controller having a hierarchy file system that is virtually hierarchized by integrating a plurality of file systems containing files which are hierarchically established on the plurality of volumes, and which manages the hierarchy file system as an access target to an access request source; wherein, when the controller receives a file size change request from the access request source, the controller extracts an access target file that is designated in the file size change request from the files belonging to the hierarchy file system, extracts a first file system among the plurality of file systems to which a real file to become an entity of the extracted access target file belongs, extracts a second file system to become a virtual migration destination of the real file, creates a new file related to the real file in the extracted second file system, associates the created new file and the access target file, and, upon subsequently receiving a data write request from the access request source for writing data into the access target file, executes data write processing of writing data into the new file.