Architecture components

This information discusses the involved architecture components for a high availability solution for SAP.

SAP Central Services
The SAP Central Services concept is applicable to both ABAP and Java™ systems. By implementing high availability for SAP Central services, you can ensure that vital services in an SAP system (enqueue and message service) are accessible at all times.
Network
An SAP high availability solution requires a fault tolerant network. Therefore, to protect against network failures, all network components need to be duplicated.
File system
The SAP system requires shared access to some directories (global, profile, trans), while shared access is optional for other directories (for example, the directory containing the executable programs). We highly recommended to use NFS also for the shared exe directory/directories. In addition, failover needs to be considered if connections to the directories are disrupted.
Database
The Db2® database server is one of the components of the SAP system that is critical to the availability of the SAP system.
Application design
The hardware, operating system, database, middle ware, as well as the SAP components and applications, provide high availability features. Other applications or connectors to be used in a high availability environment should also be designed with high availability in mind.

Parent topic: Concepts for a high availability SAP solution