Service recovery method and device, arbitration server and storage system

The present invention relates to a service recovery method and device, an arbitration server and a storage system. The method comprises after the storage system switches from a dual slave state to a fail-over state, at first, using a first storage array to send a first arbitration request to the arbitration server, when the arbitration server receives the first arbitration request sent by the first storage array, determining a first arbitration result of the first memory array and a second arbitration result of the second memory array, and after determining the first arbitration result and thesecond arbitration result, transmitting the first arbitration result to the first memory array and transmitting the second arbitration result to the second memory array; after the first memory arrayreceives the arbitration result according to the first arbitration result, initiating a negotiation to the second storage array to determine a negotiation result, and if it is determined that the first storage array is in a wi