STORAGE SYSTEM AND DATA MIGRATION PROCESSING CONTROL METHOD

摘要

The present invention appropriately processes a write command issued during data migration processing, and completes the data migration processing promptly. A copy control part 7, in a case where write data targeted at a migration-source volume 3A has been received from a host 2 during data migration processing, selects and executes one of a synchronous copy process 6A and an asynchronous copy process 6B based on either any one or multiple pieces of prescribed information 7A through 7D. This enables write command processing according to a process mode complying a storage system condition.