Computer system and recording medium

A computer system, comprising:

• a file access controller;
• a first storage device storing first file data of a first file;
• a second storage device storing second file data of a second file, which is moved from the first storage device by the file access controller based on a predetermined moving condition;
• and
• at least one client computer sending access requests of the first file and the second file,
• wherein the file access controller stores configuration information about a virtual directory tree and provides a normal directory tree and the virtual directory tree to the at least one client computer based on the configuration information,
• wherein the file access controller provides the first file to the at least one client computer through both of the normal directory tree and the virtual directory tree,
• wherein, based on the configuration information, the file access controller switches providing of the second file to the at least one client computer, 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,
• wherein, in case of the used directory tree being the normal directory tree, the file access controller sends all or part of the second file data to the at least one client computer with storing all or part of the second file data in the first storage device, for a read request included in the access requests, and
• wherein, in case of the used directory tree being the virtual directory tree, the file access controller sends all or part of the second file data to the at least one client computer with preventing to store all or part of the second file data in the first storage device, for a read request included in the access requests.

A file access management method, comprising the steps of:

• storing first file data of a first file and second file data of a second file in a first storage device coupled to a file access controller;
• moving the first file data from the first storage device to the second storage device, based on a predetermined moving condition;
• receiving access requests of the first file and the second file with the file access controller and storing configuration information about a normal directory tree and a virtual directory tree, including a correspondence to the normal directory tree;
• providing the first file to at least one client computer through both of the normal directory tree and the virtual directory tree;
• switching to providing the second file to the at least one client computer, 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;
• providing the second file to the at least one client computer, in case of the used directory tree being the normal directory tree;
• and
• preventing the providing of the second file to the at least one client computer, in case of the used directory tree being the virtual directory tree.

A file access management method, comprising the steps of:

• storing first file data of a first file and second file data of a second file in a first storage device coupled to a file access controller;
• moving the first file data from the first storage device to the second storage device, based on a predetermined moving condition;
• receiving access requests of the first file and the second file with the file access controller and storing configuration information about a normal directory tree and a virtual directory tree, including a correspondence to the normal directory tree;
• providing the first file to at least one client computer through both of the normal directory tree and the virtual directory tree;
• switching to providing the second file to the at least one client computer, 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;
• sending all or part of the data of the second file to the at least one client computer and storing all or part of the second file data in the first storage device, for a read request included in the access requests, in case of the used directory tree being the normal directory tree;
• and
• sending all or part of the second file data to the at least one client computer and preventing the storing of all or part of the second file data in the first storage device, for a read request included in the access requests.

A file access controller connected to a first storage device and a second storage device and to at least one client computer, comprising:

• a processor for storing first file data of a first file to the first storage device and for storing second file data of a second file to the second storage device, and for moving the second file data of the second file from the first storage device to the second storage device based on a predetermined moving condition;
• an interface for receiving access requests of the first file and the second file from the at least one client computer;
• a memory for storing configuration information about a virtual directory tree and providing a normal directory tree and the virtual directory tree to the at least one client computer based on the configuration information,
• wherein the first file is provided to the at least one client computer through both of the normal directory tree and the virtual directory tree,
• wherein, based on the configuration information, the providing of the second file is switched to the at least one client computer, 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,
• wherein, in case of the used directory tree being the normal directory tree, providing the second file to the at least one client computer, as the providing of the second file, and
• wherein, in case of the used directory tree being the virtual directory tree, providing the file access controller prevents to provide the second file to the at least one client computer, as the providing of the second file.

A file access controller connected to a first storage device and a second storage device and to at least one client computer, comprising:

• a processor for storing first file data of a first file to the first storage device and for storing second file data of a second file to the second storage device, and for moving the second file data of the second file from the first storage device to the second storage device based on a predetermined moving condition;
• an interface for receiving access requests of the first file and the second file from the at least one client computer;
• a memory for storing configuration information about a virtual directory tree and providing a normal directory tree and the virtual directory tree to the at least one client computer based on the configuration information,
• wherein the first file is provided to the at least one client computer through both of the normal directory tree and the virtual directory tree,
• wherein, based on the configuration information, the providing of the second file is switched to the at least one client computer, 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,
• wherein, in case of the used directory tree being the normal directory tree, the file access controller sends all or part of the second file data to the at least one client computer and stores all or part of the second file data in the first storage device, for a read request included in the access requests, and
• wherein, in case of the used directory tree being the virtual directory tree, the file access controller sends all or part of the second file data to the at least one client computer and prevents the storing of all or part of the second file data in the first storage device, for a read request included in the access requests.