Patent ID: 8117166

Claim:
A data management method in a storage device system including a control device connected to a computer, and a storage device connected to the control device, the data management method comprising: the control device receiving conditions for determining whether or not to save data stored at a certain point in time in a file from among one or a plurality of files stored in the storage device; the control device storing the conditions in the storage device system; the control device determining whether or not to create a snapshot for a subject file, which is one of the plurality of files based at least in part on an owner name of the subject file, as a snapshot creation condition; the control device receiving from the computer a request including specification of snapshot creation condition to save data stored in the subject file, and determining, based on the request, the subject file which meets the snapshot creation condition, including the owner name, and for which data stored at a certain point in time in the subject file is to be saved; the control device deciding, when a write request for the one or more files is received from the computer, after receipt of the request, whether or not a file corresponding to the write request is a file meeting the snapshot creation condition included in the request; the control device saving the data stored in the area corresponding to the write request, and then writing the data to the area specified in the write request in accordance with the write request, if a file corresponding to the write request is a file meeting the snapshot creation condition included in the request; and the control device writing the data to an area corresponding to the write request in accordance with the write request, if a file corresponding to the write request is not a file meeting the snapshot creation condition.