Patent ID: 8607010

Claim:
A computer system comprising: a first storage apparatus including a plurality of first storage devices and a first logical volume that is a portion of the plurality of first storage devices and that is configured to store file data, wherein a computer is coupled to the first storage apparatus and the first logical volume is provided to the computer by the first storage apparatus; and a second storage apparatus including a plurality of second storage devices and a second logical volume that is a portion of the plurality of second storage devices, wherein the second storage apparatus is coupled to the first storage apparatus, wherein the first storage apparatus is coupled to a fourth storage apparatus which is a back-up destination of the file data stored in the first logical volume, and the second storage apparatus is coupled to a third storage apparatus which is a back-up destination of the file data stored in the second logical volume, wherein the first storage apparatus copies the file data in the first logical volume to the second logical volume based on: (1) an availability of the file data in the first storage apparatus, which indicates a recovery speed related to a performance of the fourth apparatus from which the backed-up file data in the first logical volume is to be recovered; and (2) an availability of the file data in the second storage apparatus, which indicates a recovery speed related to a performance of the third apparatus from which the backed-up file data in the second logical volume is to be recovered, and wherein the availability of the file data in the first storage apparatus is different from the availability of the file data in the second storage apparatus.