Patent ID: 11868630
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method for changing a configuration of a storage system to be executed by the storage system,
the storage system including a first node mounted on two controllers, and a plurality of storage media,
the two controllers of the first node being subjected to setting of redundancy such that the two controllers belong to differing redundancy groups, respectively, and
the method for changing the configuration of the storage system including:
a first step of setting, by a second node, in a case where a configuration change is requested due to addition of the second node mounting at least one other controller to the storage system, the at least one other controller of the second node belongs to a redundancy group to which either of the two controllers of the first node belongs;
a second step of changing, by the first node, the setting of redundancy such that setting information on the redundancy group of either of the two controllers of the first node does not change; and
a third step of deactivating, by the first node, a controller of the two controllers of the first node for which the setting information on the redundancy group changes as a result of a change in the setting of redundancy,
wherein the controller of the two controllers of the first node holds first management information for setting redundancy using one node, and second management information for setting redundancy using two or more of nodes,
wherein the first management information and the second management information include the setting information on the redundancy group to be set to the controller of the two controllers of the first node mounted on the first node, and
wherein the first step includes a step of referring, the at least one other controller of the second node, to the first management information and the second management information to determine the redundancy group to which the at least one other controller belongs on a basis of a same setting information on the redundancy group in the first management information and the second management information.