3.1.1 HA cluster system

(1) The system configuration of PFM - RM for Oracle monitoring Oracle Database in an HA cluster system

You can improve availability of an Oracle Database (single-instance Oracle) by using it in an HA cluster system, which can perform a failover if a failure occurs.

Typically, when you operate Oracle in an HA cluster system, you construct an environment that permits execution of the same Oracle instance on both an executing node and a standby node. The configuration you use stores a single set of Oracle data (data files, configuration files, log files, etc.) on a shared disk.

When you monitor Oracle in an HA cluster system by PFM - RM for Oracle, the network environment must be set up so that the host on which you install PFM - RM for Oracle can connect to the monitoring target Oracle host by its logical hostname and logical IP.

You can configure PFM - RM for Oracle as if PFM - RM for Oracle monitors an Oracle host in non-cluster system, when the monitoring target Oracle host is configured as in the following figures:

Figure 3‒1: Example of PFM - RM for Oracle monitoring Oracle in HA cluster system

To control Oracle, you usually use solution products for controlling Oracle from the cluster software. For example, you use Oracle Fail Safe with Windows MSCS. For UNIX, you use products provided by various cluster software vendors.

There are also cases when the configuration or method of operating Oracle in a cluster system depends on the system.

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(2) PFM - RM for Oracle configuration in an HA cluster system

PFM - RM for Oracle can operate in an HA cluster system and can monitor Oracle in a cluster configuration. Figure 3-2 shows a configuration for operating PFM - RM for Oracle in an HA cluster system.

Figure 3‒2: Example of an PFM - RM for Oracle configuration in an HA cluster system

As Figure 3-2 shows, PFM - RM for Oracle operates in a cluster system and monitors Oracle.

When a failure occurs, failover applies to PFM - RM for Oracle at the same time it applies to Oracle, allowing PFM - RM for Oracle to continue monitoring Oracle.

PFM - RM for Oracle also stores definition information about the shared disk and continues operating when a failover occurs. When there are multiple Performance Management programs on a single logical host, all programs use the same shared directories.

When you monitor multiple Oracles, you can install PFM - RM for Oracle on separate logical hosts so that each PFM - RM for Oracle can operate and perform a failover independently.

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