Patent ID: 8205041
Filing Date: 2012-06-19
Classification: G06F

Abstract:
1. A virtual tape apparatus interposed between a host and a library device that makes an access to a physical tape volume so as to store data transmitted from the host to a logical tape volume, the apparatus comprising: a data reception section that receives data transmitted from the host; a storage device having a logical tape volume for storing the data; a management table that retains attribute information of data stored in the physical tape volume; a write starting position determination section that determines the write starting position of the data stored in the logical tape volume on the physical tape volume, the write starting position determination section determining, out of data that have been written in the physical tape volume, data that has been invalidated and data to become invalidated through the current write processing based on the attribute information retained in the management table and determining the next position of valid data which is located at the endmost side among valid data stored in the physical tape volume as the write starting position; and a write processing section that writes data in the logical tape volume to the physical tape volume based on a result of the determination.