Modern SAP systems, running critical workloads, have to meet the highest standards for availability of their SAP services. SAP already comes with some basic redundancy mechanisms out of the box. However, for a full high availability, SAP relies on third-party, high availability cluster solutions, that are designed to cover all components in the SAP solution stack that could fail and cause an interruption of the SAP services. The protected components include for example the SAP NetWeaver software, SAP databases, the network, server hardware and the underlying storage systems.