Patent ID: 9395922
Filing Date: 2016-07-19
CPC Classification: G06F

Claim Text:
1. An information system comprising: first and second storage apparatuses each coupled to a host computer that transmits an I/O request as a write request or a read request, and which are configured to copy, upon receiving the write request, data corresponding to the received write request to a counterpart storage apparatus; a first quorum apparatus coupled to the first and the second storage apparatuses; and a second quorum apparatus coupled to the first and the second storage apparatuses, wherein the first and the second storage apparatuses are each configured to: perform control to determine whether to execute the I/O request in accordance with an execution feasibility setting, and set a first attribute as an attribute of one of the first and the second quorum apparatuses and set a second attribute as an attribute of the other one of the first and the second quorum apparatuses, and wherein, in health check processing that is repeatedly executed, the first and the second storage apparatuses are each configured to: store survival information indicating whether the storage apparatus is surviving in the first and the second quorum apparatuses, check whether the survival information of the counterpart storage apparatus is able to be checked from any one of the first and the second quorum apparatuses, and, when the survival information of the counterpart storage apparatus is unable to be checked from the quorum apparatus with the first attribute, the survival information of the counterpart storage apparatus is checked from the quorum apparatus with the second attribute, and set the execution feasibility setting of the storage apparatus based on whether the survival information of the storage apparatus is able to be stored in one or both of the first and the second quorum apparatuses, and whether the survival information of the counterpart storage apparatus is able to be checked from any one of the first and the second quorum apparatuses, wherein, in the health check processing, the first and the second storage apparatuses are each configured to: set the execution feasibility setting to indicate being capable of executing the I/O request when synchronous copying is executable, and both the storage apparatus and the counterpart storage apparatus are able to store the survival information in at least one of the first and the second quorum apparatuses.