Patent ID: 6763442
Filing Date: 2004-07-13
Classification: G06F,H04L,Y10S

Abstract:
A computer system comprising:a first computer including an application; a second computer including a file system and a manager; a plurality of storage systems each including at least one logical storage area, usage information of the at least one logical storage area, meta data to be addressed by the file system, and a control unit coupled with the at least one logical storage area, the meta data including correlation information between a file ID used by the application and a first ID designating a logical location storing file data; a storage device to be accessed by the second computer, the storage device configured to store correlation information between the first ID and a second ID designating a logical storage area storing the file data; and a switch coupled with the first computer, the second computer, and the plurality of storage systems; wherein the first computer is configured to notify the file system in the second computer of file accessing according to an access notification including a file ID issued from the application in the first computer; wherein the file system, upon receiving the access notification from the first computer, is configured to acquire a second ID designating a logical storage area storing access target file corresponding to the received file ID by referring to a meta data and the correlation information in the storage device, and to send the acquired second ID to the first computer; wherein the first computer is configured to issue an access request to one of the storage systems which includes a logical storage area designated by the acquired second ID; wherein the storage system which receives the access request from the first computer is configured to access the file data stored in the logical storage area designated by the received second ID and to update usage information of the logical storage area of the storage system according to the access request; and wherein the manager of the second computer is configured to acquire usage information from each of the plurality of storage systems, to issue to the switch a data reallocation command for copying file data stored in a source logical storage area in a source storage system of the plurality of storage systems to a target logical storage area in a target storage system of the plurality of storage systems according to the acquired usage information, and to update the meta data according to the data reallocation.