| 摘要 |
A snapshot volume is migrated by using a primary volume of a migration destination storage apparatus. The management server comprises a controller for generational management, by means of the snapshot volumes, of differential data for the logical volume which is the parent volume of the snapshot volume, and, if an instruction to copy a snapshot volume of a designated generation is received and a snapshot volume prior to the designated generation of the copy instruction-target snapshot volume exists, the controller copies the differential data between the designated-generation snapshot volume and the existing snapshot volume, and associates the copied differential data with the existing snapshot volume. |
| 主权项 |
1. A storage system coupled to a host which issues data write requests to a first storage apparatus,
wherein the storage system comprises the first storage apparatus, a second storage apparatus, and a management server configured to manage the first storage apparatus and the second storage apparatus, wherein the first storage apparatus comprises first storage devices providing first storage areas, and a first storage controller configured to create a logical volume, a first snapshot volume, and a second snapshot volume in the first storage areas, wherein the first snapshot volume and the second snapshot volume are data images derived from the logical volume, and a generation of the first snapshot volume is prior to a generation of the second snapshot volume, wherein the second storage apparatus comprises second storage devices providing second storage areas, and a second storage controller configured to create at least one snapshot volume in the second storage areas, wherein the management server comprises a management controller configured to manage relationships among generations of volumes including the logical volume, the first snapshot volume, and the second snapshot volume, and wherein when the second snapshot volume is to be copied from the first storage apparatus to the second storage apparatus, the management server is configured to:
execute a determination whether or not the first snapshot volume, whose generation is posterior to a generation of the logical volume and prior to the generation of the second snapshot volume, exists in the second storage apparatus; andin a case that the first snapshot volume exists in the second storage apparatus, send the first storage apparatus an instruction to copy differential data between the first snapshot volume and the second snapshot volume according to the determination. |
