Abstract: A file storage control device (for example NAS) comprises a storage space provision portion, which provides, to a higher-level device used by a user, a single storage space associated with a plurality of logical storage units (LUs) provided by a storage system; a reception portion, which receives requests to write files to the provided storage space from the higher-level device; and a storage control portion, which selects a LU from among the plurality of LUs associated with the storage space specified by the write request, and stores all the data constituting the file according to the write request in the selected LU.

Abstract: Provided is a method for controlling a computer system including a first server computer, a second server computer, at least one data storing device, and a client computer. The first server computer manages a first file system. The second server computer manages a second file system. The second file system includes data copied from the first file system. Data written in the second file system after data is copied from the first file system is stored in a shared volume. In the method, when a load on the second server computer is higher than a load on the first server computer, copy of the data stored in the shared volume to the first file system is started and a read request from a client computer is issued to the first server computer. Accordingly, it is possible to execute high-speed distribution of an access load of a storage system.

Abstract: A file storage control device (for example NAS) comprises a storage space provision portion, which provides, to a higher-level device used by a user, a single storage space associated with a plurality of logical storage units (LUs) provided by a storage system; a reception portion, which receives requests to write files to the provided storage space from the higher-level device; and a storage control portion, which selects a LU from among the plurality of LUs associated with the storage space specified by the write request, and stores all the data constituting the file according to the write request in the selected LU.