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

Claim 5:
6. The storage system according to claim 5, wherein
the second controller, when having executed the garbage collection, transmits, to all other controllers, updated version information representing that the version of the predetermined storage area has been updated,
a controller that has received the updated version information manages the updated version information as latest version information about the predetermined storage area, and
the first controller acquires, when the version information about the latest version and the predetermined version information do not match, 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.