Patent ID: 7308544

Claim:
A storage control apparatus control method for reading/writing data with respect to a storage device in response to a data input/output request transmitted from an information processing apparatus, said storage control apparatus being in a plurality of storage control apparatuses communicatably connected via a network to each other, comprising the steps of: storing a first period during which data is required to be stored, said data being stored in a first storage area corresponding to a storage area of said storage device to which said storage control apparatus reads/writes the data, the data having an expiration period; storing a first physical life time period in which said first storage area can store the data without expiration; storing a second physical life time period in which a second storage area can store the data without expiration; when a condition is satisfied, said condition being before an end of the first physical life time period and before an end of the data expiration period and before an end of the second physical life time period, transferring said data stored in said first storage area to said second storage area; relating a remaining useful life time period of the data with the second storage area; and storing the relationship.