Planning the Sun Cluster HA for SAP DB Installation and Configuration

This section contains the information that you need to plan your Sun Cluster HA for SAP DB installation and configuration.

Before you begin, consult your SAP DB documentation for configuration restrictions and requirements that are not imposed by Sun Cluster software. For information about restrictions that the Sun Cluster software imposes, see the Sun Cluster documentation.

Configuration Requirements

The configuration requirements in this section apply only to Sun Cluster HA for SAP DB.

If your data service configuration does not conform to these requirements, the data service configuration might not be supported.

For requirements that apply to all data services, see “Configuration Guidelines for Sun Cluster Data Services” in Sun Cluster Data Services Planning and Administration Guide for Solaris OS.

SAP DB Software Version Requirements

Use SAP DB version 7.4 or compatible versions.

Sun Cluster HA for SAP DB Configuration Requirements

Configure Sun Cluster HA for SAP DB as a failover data service. You cannot configure Sun Cluster HA for SAP DB as a scalable data service. For more information, see the following sections:

• How to Enable SAP DB to Run in a Cluster

• How to Register and Configure an SAP DB Resource

SAP xserver Configuration Requirements

To enable client applications to access Sun Cluster HA for SAP DB, you must use SAP xserver. Configure SAP xserver as a scalable data service. Do not configure SAP xserver as a failover data service.

Configure SAP xserver so that SAP xserver starts on all nodes to which the SAP DB resource can fail over. To implement this configuration, ensure that the node list of the SAP xserver resource group contains all nodes that are in the node list of the SAP DB resource group. For more information, see How to Register and Configure an SAP xserver Resource.

Supported Configurations of This Data Service

The Sun Cluster HA for SAP DB data service supports configurations that conform to the requirements in Configuration Requirements.

If you plan to use SAP DB with other highly available SAP applications, you must also configure the Sun Cluster data services for those applications. For more information, see the following table.

The examples that follow show these supported configurations of Sun Cluster HA for SAP DB:

• Two-node cluster configuration

• Four-node cluster configuration with SAP R/3

• Four-node cluster configuration with SAP R/3 and SAP liveCache

Sun Cluster HA for SAP DB might support additional configurations. However, you must contact your Sun service provider for information about additional configurations.

Example 1–1 Two-Node Configuration

This example shows a two-node configuration in which a client application accesses the SAP DB resource through the SAP xserver resource. The characteristics of this configuration are as follows:

• The SAP DB resource is configured as a failover data service.

• The SAP xserver resource is configured as a scalable data service.

Example 1–2 Four-Node Configuration With SAP R/3

This example shows a four-node configuration in which SAP DB is used with SAP R/3. This configuration uses multiple Advanced Planner & Optimizer (APO) application servers. The characteristics of this configuration are as follows:

• The SAP APO Central Instance (CI) resource is configured as a failover data service.

• The SAP DB resource is configured as a failover data service.

• The SAP xserver resource is configured as a scalable data service.

• APO application server (APP) resources are configured as scalable data services.

Example 1–3 Four-Node Configuration With SAP R/3 and SAP liveCache

This example shows a four-node configuration in which SAP DB is used with SAP R/3 and SAP liveCache. This configuration uses multiple APO application servers. The characteristics of this configuration are as follows:

• The SAP APO CI resource is configured as a failover data service.

• The SAP DB resource is configured as a failover data service.

• The SAP xserver resource is configured as a scalable data service.

• APP resources are configured as scalable data services.

• The SAP liveCache resource is configured as a failover data service.

Configuration Considerations

The configuration considerations in the subsections that follow affect the installation and configuration of Sun Cluster HA for SAP DB.

Device Group for the SAP DB Application

Ensure that you create a device group for the SAP DB application as follows:

• Install SAP DB on its own global device group. For more information, see Installing and Configuring SAP DB. This separate global device group for SAP DB ensures that the SAP DB resource can depend on the HAStoragePlus resource only for SAP DB.

• Create an HAStoragePlus resource for the global device group on which SAP DB is installed. For more information, see Configuring the HAStoragePlus Resource Type to Work With Sun Cluster HA for SAP DB.

• Ensure that the resource for SAP DB depends on the HAStoragePlus resource for the global device group on which SAP DB is installed. For more information, see Registering and Configuring Sun Cluster HA for SAP DB.

Dependencies of the SAP DB Application on SAP xserver

Configure SAP DB so that SAP DB starts only on a node where SAP xserver is running. To implement this configuration, configure resources and resource groups as follows:

• Ensure that the resource for SAP DB depends on the resource for SAP xserver.

• Create on the SAP DB resource group a strong positive affinity for the SAP xserver resource group.

For more information, see Registering and Configuring Sun Cluster HA for SAP DB.

Administration of SAP xserver by a User Other Than Root

You might be required to administer SAP xserver as a user other than root. In this situation, you must create and define that user as follows:

• You must create that user on all cluster nodes that master SAP xserver.

• You must define that user when you register and configure Sun Cluster HA for SAP DB. For more information, see Registering and Configuring Sun Cluster HA for SAP DB.

Configuration Planning Questions

Answer the questions in this section to plan the installation and configuration of Sun Cluster HA for SAP DB. Write the answers to these questions in the space that is provided on the data service worksheets in “Configuration Worksheets” in Sun Cluster Data Services Planning and Administration Guide for Solaris OS.

• Which resource group will you use for the SAP DB application resource and for the logical hostname for the SAP DB resource?

  Use the answer to this question when you perform the procedure How to Enable SAP DB to Run in a Cluster.

• What is the logical hostname for the SAP DB resource? Clients access the data service through this logical hostname.

  Use the answer to this question when you perform the following procedures:

  • How to Install and Configure SAP DB

  • How to Enable SAP DB to Run in a Cluster

• Where will the system configuration files reside?

  See Sun Cluster Data Services Planning and Administration Guide for Solaris OS for the advantages and disadvantages of using the local file system instead of the cluster file system.