Sun Cluster 2.2 Data Services Update: SAP With Oracle, SAP With Informix

Sun Cluster HA for SAP Overview

The Sun Cluster HA for SAP data service eliminates single points of failure in a SA system and also provides fault monitoring and failover mechanisms for the SAP application.

These basic services of the SAP system should be placed within the Sun Cluster framework:

Database instance
Central instance (consisting of message server, enqueue server, and dispatcher)

NFS file service

In a Sun Cluster configuration, protection of SAP components is best provided as described in Table 1-1.

Table 1-1 Protection of SAP Components


SAP Component	Protected by...
SAP database instance	Sun Cluster HA for Oracle or Sun Cluster HA for Informix
SAP central instance	Sun Cluster HA for SAP
NFS file service	Sun Cluster HA for NFS
SAP application servers	SAP, through redundant configuration

The Sun Cluster HA for SAP data service can be installed during or after initial cluster installation. Before you register and start Sun Cluster HA for SAP, you must have a functioning cluster that already contains logical hosts and associated IP addresses and disk groups.

See Chapter 3, "Installing and Configuring Sun Cluster Software," in the Sun Cluster 2.2 Software Installation Guide for details about initial installation of clusters and data services. The Sun Cluster HA for SAP data service can be registered after the basic components of the Sun Cluster and SAP software have been installed.