Storage system and data management method

Abstract

Proposed is a storage system and a data management method enabling the easy operation of the storage system and capable of alleviating the burden on a system administrator by managing the full backup and snapshot in the same storage extent. This storage system includes a creation unit for associating a part or the whole of a storage extent of the secondary volume and creating a pool volume to be supplied with a dynamic memory storage extent from the logical volume, a first storage unit for storing difference data corresponding to the primary volume as backup data in the pool volume in order to store, based on a write command of data from the host system in an arbitrary address in the primary volume, the data in the primary volume and update the primary volume, and a second storage unit for storing data that is not updated in the primary volume based on a snapshot command from the host system for acquiring a snapshot on a primary volume at a prescribed timing as difference data or a difference data group in the pool volume.