HA for SAP NetWeaver supports configurations that conform to the requirements that are specified in the previous section. All configurations of HA for SAP NetWeaver have the following requirements: ■ The SAP central service is configured as a failover resource. ■ The SAP replicated enqueue server is configured as a failover resource. ■ The SAP application server instances which are primary application instances or additional application instances can be configured either as a failover resource or as a multiple master data service resource. ■ Each SAP instance resource must be dependent on a SAP sapstartsrv resource. ■ Do not configure central service resources and replicated enqueue resources in the same resource group. ■ The SAP replicated enqueue server resource is configured to depend on the SAP central service resource. This dependency ensures that the SAP replicated enqueue server does not attempt to start until the SAP central service is online. ■ The SAP central services resource group is configured to have weak positive affinity with the SAP replicated enqueue server resource group. This affinity ensures that, if a hardware or software failure occurs on the node or zone that is mastering the SAP central services resource group, the SAP central services resource group fails over to the node or zone where the SAP replicated enqueue server resource group is currently running. ■ You must configure the SAP replicated enqueue preempter resource in the SAP central services resource group. This is to ensure that if the SAP central services resource group fails over to the node running the SAP replicated enqueue server resource group is offloaded after the central services are online and the enqueue table is copied to the enqueue server process. This off-load happens once a node is available to host the replicated enqueue server resource group. The following example shows the following supported configurations of HA for SAP NetWeaver. ■ The SAP NetWeaver component is configured as a failover resource. ■ The SAP NetWeaver component is configured as a multiple master resource
