HA for SAP NetWeaver Overview

The SAP NetWeaver platform consists of the following components:

SAP central services, which include these servers:
- SAP enqueue server
- SAP message server
- SAP gateway server
SAP replicated enqueue server
SAP primary application instance
SAP additional dialogue instance

Each component can be treated as a specific instance. Each instance has its own controlling process named sapstartsrv.

The SAP NetWeaver platform can be deployed as an ABAP, a JAVA, or a dual stack. In the dual stack, the primary application instance and the dialogue instance combine the ABAP and the JAVA processes in one instance. The central services and the replicated enqueue server implement either the ABAP or the JAVA deployment only.

Caution - For a detailed description of the SAP NetWeaver platform in the High Availability environment, see the SAP documentation at http://service.sap.com/ha. In particular, study the section that provides an overview of the architecture of the SAP NetWeaver to be certain that you understand the basic concepts of your version of the SAP NetWeaver.

To eliminate potential single points of failure in an SAP NetWeaver platform, HA for SAP NetWeaver provides fault monitoring, automatic restart, and automatic failover for the components of the SAP NetWeaver platform.

The primary and additional dialogue instances can be configured as multiple master or failover deployments. All other instances must be failover deployments.

Each component of the SAP NetWeaver platform has a data service that protects the component in an Oracle Solaris Cluster configuration, as described in the following table.

Table 1-1 Protection of SAP NetWeaver Components by Oracle Solaris Cluster Data Services

SAP NetWeaver Component	Data Service
SAP `sapstartsrv` process	Resource type for the SAP `sapstartsrv` process. The resource type is `ORCL.sapstartsrv`.
SAP central services	Resource type for SAP central services in HA for SAP NetWeaver. The resource type is `ORCL.sapcentr`.
SAP replicated enqueue server	Resource type for SAP replicated enqueue server in HA for SAP NetWeaver. The resource type is `ORCL.saprepenq`.
SAP primary instance and SAP additional dialogue instance	Resource type for SAP primary instance and SAP additional dialogue instance in HA for SAP NetWeaver. The resource type is `ORCL.sapdia`.
SAP replicated enqueue preempter	Resource type for SAP replicated enqueue preempter in HA for SAP NetWeaver. The resource type is `ORCL.saprepenq_preempt`.
Database	The data service for the database that you are using.
NFS file system	Oracle Solaris Cluster HA for NFS. For more information about this data service, see Oracle Solaris Cluster Data Service for Network File System (NFS) Guide.

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