Patent ID: 8825725
Filing Date: 2014-09-02
Classification: G06F

Abstract:
1. A management server comprising: a physical server virtually including a virtual server with a virtual hard disk, the management server including: a used volume acquiring unit configured to acquire a used volume of a first file system for use by the virtual server and built on the virtual hard disk file; a file size acquiring unit configured to acquire a file size of the virtual hard disk file corresponding to the first file system, and a calculating unit configured to calculate an optimized file size of the virtual hard disk file based on the difference between the used volume and the file size, wherein the virtual hard disk file is included in a second file system managed by a management Operating System on the physical server, the calculating unit calculating the optimized file size based on a difference between the total file size adding up the file size of the virtual hard disk file and the file size of any other virtual hard disk file, and the total used volume adding up the used volume of the first file system corresponding to the virtual hard disk file and the used volume of a file system corresponding to the other virtual hard disk file.