COMPUTER SYSTEM AND RECORDING MEDIUM USING A VIRTUAL FILE SYSTEM IN A HIERARCHICAL STORAGE MANAGEMENT

摘要

A computer system comprising storage devices having different characteristics, a client computer, and a file access controller managing the storage devices with a hierarchical storage management system is disclosed. The file access controller provides a normal directory tree and a virtual directory tree, according to the configuration, and provides a first file stored in a first storage device through the normal directory tree and the virtual directory tree. And, the file access controller switches providing of a second file stored in a second storage device, depending on a used directory tree, which is used by the at least one client computer, and which is the normal directory tree or the virtual directory tree. Examples of the switch are about accessibility of the second file and recall processing of the second file.