Patent ID: 11914868
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. The storage system according to claim 1,
wherein the at least one of the plurality of nodes is configured to:
determine whether the state value of the target drive is the third value in a case of reading the data out from the target drive;
refer to the difference information to determine whether the data writing have been performed on the storage area storing data to be read out, in a case where the state value of the target drive is not the third value; and
restore the data to be read out by using data stored in at least one of the plurality of drives that belongs to the first parity group and that sets the third value as the state value, in a case where the data writing have been performed on the storage area storing the data to be read out, and send the data to a request source.