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.