Providing high availability in an active/active appliance cluster

A computer program product for routing data by an appliance in an appliance cluster, wherein the appliance cluster is a high-availability active/active appliance cluster, wherein the computer program product comprises a non-transitory computer readable storage medium having program code embodied therewith, the program code readable and executable by a processor to perform a method comprising:

• receiving messages assigned by a self-balancing module for balancing a load of appliances in the appliance cluster, wherein the appliance cluster comprises two backup standby groups, wherein the two backup standby groups are a persistent storing standby group and a transaction processing standby group, wherein the persistent storing standby group is a subset of the transaction processing standby group and comprises a primary database (DB) appliance and a secondary DB appliance, wherein the transaction processing standby group comprises a primary active appliance and a standby appliance, and wherein the primary active appliance comprises the self-balancing module;
• storing persistent storing data generated by processing the messages to a virtual persistent storage, wherein the virtual persistent storage provides an interface between a persistent storage of the primary DB appliance and an application for processing the messages;
• and
• linking the virtual persistent storage to the persistent storage of the primary DB appliance in the persistent storing standby group in response to an appliance that receives the messages not being the primary DB appliance, so as to route the persistent storing data to the persistent storage of the primary DB appliance, thereby sending the persistent storing data to the persistent storage of the primary DB appliance.