Patent ID: 11947811
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. The storage system according to claim 1, wherein
the controller is configured to:
when writing is performed in the logical volume, store data to be written in a new area of the pool volume, associate an address of a write destination in the logical volume with the data to be written and associate a generation of the logical volume with the second control information by switching a correspondence relationship between the first control information and the second control information;
set second control information whose correspondence relationship with the first control information is canceled by switching the correspondence relationship as a target of the invalidation; and
determine that the invalidation is possible if a generation of the second control information to be invalidated matches a generation associated with the first control information of the logical volume by comparison.