This application provides astorage cluster configurationmodification method, an apparatus, a computer system, and the like. In a storage cluster that uses a consensus replication protocol, when half of storage nodes become faulty, if it is determined that at least one storage node exists in the storage cluster after the fault, and a latest log index number of the storage node is greater than or equal to an index number of a committed log provided by the storage cluster for a client, an arbitration module sends a forced cluster configuration change instruction to a fault-free storage node. The forced cluster configuration change instruction is used to instruct the fault-free storage node to modify local cluster configuration information. In addition, the arbitration module updates cluster configuration information stored in a configuration library, so that updated cluster configuration information indicates a new cluster configuration. In this way, a problem of unavailability of the storage cluster after half of the storage nodes become faulty is resolved, and availability of the storage cluster is improved.
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