Patent ID: 8560886

Claim:
A method comprising: receiving a read request to access data, wherein the receiving is performed by a primary computing system, and the read request is received during a failback process but prior to completing the failback process; determining whether the data to be accessed for the read request was affected by an unreplicated write request, wherein the unreplicated write request is a write request that was performed at the primary computing system but not replicated to a secondary computing system prior to the start of a failover process; determining whether the data to be accessed for the read request was modified during the failover process, wherein the failover process occurs before the failback process; if the data to be accessed for the read request was modified during the failover process or affected by the unreplicated write request, redirecting the read request to the secondary computing system; and if the data to be accessed for the read request was not modified during the failover process, accessing the data from a primary data storage, wherein the primary computing system is coupled to the primary data storage.