Patent ID: 7689837
Filing Date: 2010-03-30
Classification: H04L

Abstract:
1. A computer system comprising: a first storage system coupled to a computer; a second storage system coupled to the first storage system; and a management computer coupled to the first storage system and the second storage system, wherein the first storage system comprises: wherein the second storage system comprises: wherein the management computer comprises a memory that stores encryption method compatibility information which indicates compatibility between a plurality of encryption methods including the first encryption method and the second encryption method, wherein when the management computer receives a migration instruction of data migration of encrypted data stored in one of the plurality of first volumes, the management computer searches the encryption method compatibility information for an encryption method which has compatibility with the first encryption method used in the first data encryption module included in the first storage system, and wherein when the second encryption method which is used in the second data encryption module included in the second storage system is compatible with the first encryption method, the management computer selects the second storage system as a destination of the data migration, and instructs to migrate the encrypted data stored in the one of the plurality of first volumes, for which the migration instruction was received, to one of the plurality of second volumes.