Patent ID: 11960771
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. The storage system according to claim 2, wherein
the second controller, when having executed the garbage collection, transmits, to the storage apparatus, updated version information representing that the version of the predetermined storage area has been updated,
the storage apparatus, when receiving the updated version information from the second controller, manages the updated version information as latest version information about the predetermined storage area, and
the first controller, when receiving the response information, acquires, from the second controller, the post-migration mapping information and post-migration version information representing a version of a storage area where the data is stored after being migrated by the garbage collection, updates the second mapping information by using the post-migration mapping information, and changes the predetermined version information about the predetermined storage area to the post-migration version information about the storage area to which the data has been migrated.