Abstract: A computer system includes a first computer for receiving access requests to files from clients, a first storage device that is connected to the first computer and stores file management information, a second computer that receives access requests to data from the first computer, and a second storage device that is connected to the second computer and stores file data. Each time file data is received from the client, the first computer assigns identification information to the file data and stores the filename designated by the client and the identification information in the first storage device. The first computer stores the file data in the second storage device via the second computer.

Abstract: A network attached storage (NAS) system includes a disk array unit equipped with a copy device that copies data, and a NAS processing unit that provides file service via a network and is connected via a communication path to the disk array unit. The NAS processing unit is equipped with a snapshot management device that manages snapshots. The snapshot management device of the NAS processing unit designates a physical block to be copied as a snapshot. The copy device on the disk array unit copies the designated physical block within the disk array unit to create a snapshot and stores the snapshot in a separated region. The snapshot management device of the NAS processing unit manages meta data of the snapshot data in a manner accessible by the user depending on requirements.

Abstract: A computer system includes a first computer for receiving access requests to files from clients, a first storage device that is connected to the first computer and stores file management information, a second computer that receives access requests to data from the first computer, and a second storage device that is connected to the second computer and stores file data. Each time file data is received from the client, the first computer assigns identification information to the file data and stores the filename designated by the client and the identification information in the first storage device. The first computer stores the file data in the second storage device via the second computer.

Abstract: A network attached storage (NAS) system includes a disk array unit equipped with a copy device that copies data, and a NAS processing unit that provides file service via a network and is connected via a communication path to the disk array unit. The NAS processing unit is equipped with a snapshot management device that manages snapshots. The snapshot management device of the NAS processing unit designates a physical block to be copied as a snapshot. The copy device on the disk array unit copies the designated physical block within the disk array unit to create a snapshot and stores the snapshot in a separated region. The snapshot management device of the NAS processing unit manages meta data of the snapshot data in a manner accessible by the user depending on requirements.