This section discusses how you can use switchover strategies to protect services that are of critical importance for the availability of an SAP system. Services that are vital for the operation of SAP NetWeaver AS are:
? Enqueue service
· Message service
· Network File System (NFS) service
These are also known as system-wide, single points of failure (SPOFs) because they cannot be configured redundantly. If a host running one of these services crashes, the service can be transferred to another host within the cluster using switchover software.