Pre-Installation Requirements

Before you install the SAP software, see "Installing and Configuring SAP and Database", understand the following requirements.

• After you create all of the file systems for the database and for SAP software, create the mount points, and put the mount points in the /etc/vfstab file on all of the cluster nodes - See the SAP installation guides, Installation of the SAP R/3 on UNIX and R/3 Installation on UNIX-OS Dependencies, for details on how to set up the database and SAP file systems.

• Create the required groups and users on all of the cluster nodes - See the SAP installation guides, Installation of the SAP R/3 on UNIX and R/3 Installation on UNIX-OS Dependencies, for details on how to create SAP groups and users.

• Configure Sun Cluster HA for NFS on the cluster that hosts the central instance if you plan to install some external SAP application servers - See "Installing and Configuring Sun Cluster HA for NFS" in the Sun Cluster 3.0 12/01 Data Services Installation and Configuration Guide for details on how to configure Sun Cluster HA for NFS.

• Set up the /etc/nsswitch.conf file so that the data service starts and stops correctly during switchovers or failovers - On each node that can master the logical host that runs Sun Cluster HA for SAP, the /etc/nsswitch.conf file must have one of the following entries for group.

  group: group: files group: files [NOTFOUND=return] nis group: files [NOTFOUND=return] nisplus

  Sun Cluster HA for SAP uses the su user command to start and stop the database node. The network information name service might become unavailable when a cluster node's public network fails. Add one of the preceding entries for group to ensure that the su(1M) command does not refer to the NIS/NIS+ name services if the name service becomes unavailable.