Failover and Scalable Applications

• Retrieve the latest patch for the sapstart executable – This patch enables Sun Cluster HA for SAP users to configure a lock file. For details on the benefits of this patch in your cluster environment, see Setting Up a Lock File.

• Read all of the related SAP online service-system notes for the SAP software release and database that you are installing on your Sun Cluster configuration – Identify any known installation problems and fixes.

• Consult SAP software documentation for memory and swap recommendations – SAP software uses a large amount of memory and swap space.

• Generously estimate the total possible load on nodes that might host the central instance, the database instance, and the application server, if you have an internal application server – This consideration is especially important if you configure the cluster to ensure that the central instance, database instance, and application server will all exist on one node if failover occurs.