Patent ID: 8046392

Claim:
A storage system comprising: a first storage device that includes a first file system; a second storage device that includes a second file system; and a control unit that controls transfer of a file stored in a storage area in the first storage device to a storage area in the second storage device, the control unit performing the following operations: collecting from the first storage device first information about a first management structure of the first file system, said first management structure being configured by a first directory tree having a path length; collecting from the second storage device second information about a second management structure of the second file system, said second management structure being configured by a second directory tree having a path length; comparing the first information with the second information and judging whether or not a first limit value for the first management structure exceeds a second limit value for the second management structure; and if the first limit value exceeds the second limit value, converting the first management structure so that the property of the first management structure does not exceed the second limit value, arranging the second file system so that it includes the converted management structure, and transferring the file stored in the first storage device serving as a transfer source storage device to the second storage device serving as a transfer destination storage device, using the converted management structure included in the second file system; wherein, if a maximum path length of the first directory tree created in the transfer-source storage device exceeds the full path length of a directory tree that can be handled by the transfer-destination storage device, the first directory tree in the transfer-source storage device is divided into a plurality of divided directory trees and the divided directory trees are created in the transfer-destination storage device and associated with each other using a symbolic link.