Guidelines for Setting Timeouts

Many of the extension properties for Sun Cluster Support for Oracle Real Application Clusters specify timeouts for steps in reconfiguration processes. The optimum values for most of these timeouts are independent of your cluster configuration. Therefore, you should not need to change the timeouts from their default values.

Timeouts that depend on your cluster configuration are described in the subsections that follow. If timeouts occur during reconfiguration processes, increase the values of these time-out properties to accommodate your cluster configuration.

VxVM Component Reconfiguration Step 4 Timeout

The time that is required for step 4 of a reconfiguration of the VxVM component of Sun Cluster Support for Oracle Real Application Clusters is affected by the size and complexity of your VERITAS shared-disk group configuration. If your VERITAS shared-disk group configuration is large or complex and the reconfiguration of the VxVM component times out, increase the timeout for step 4 of a reconfiguration of the VxVM component.

To increase the timeout for step 4 of a reconfiguration of the VxVM component, increase the value of the Cvm_step4_timeout extension property of the SUNW.rac_cvm resource.

For more information, see SUNW.rac_cvm Extension Properties.

Example 2–3 Setting the VxVM Component Reconfiguration Step 4 Timeout

# scrgadm -c -j rac_cvm -x cvm_step4_timeout=1200

This example sets the timeout for step 4 of a reconfiguration of the VxVM component to 1200 seconds. This example assumes that the VxVM component is represented by an instance of the SUNW.rac_cvm resource type that is named rac_cvm.

Reservation Step Timeout

The time that is required for reservation commands to run is affected by the following factors:

• The number of shared physical disks in the cluster

• The load on the cluster

If the number of shared physical disks in the cluster is large, or if your cluster is heavily loaded, the reconfiguration of Sun Cluster Support for Oracle Real Application Clusters might time out. If such a timeout occurs, increase the reservation step timeout.

To increase the reservation step timeout, increase the Reservation_timeout extension property of the appropriate resource for your storage management scheme.

Details of the extension properties of these resource types are available in the following sections:

• SUNW.rac_svm Extension Properties

• SUNW.rac_cvm Extension Properties

• SUNW.rac_hwraid Extension Properties

Example 2–4 Setting the Reservation Step Timeout

# scrgadm -c -j rac_hwraid -x reservation_timeout=350

This example sets the timeout for the reservation step of a reconfiguration of Sun Cluster Support for Oracle Real Application Clusters to 350 seconds. In this example, the cluster uses hardware RAID support. This example assumes that the hardware RAID component is represented by an instance of the SUNW.rac_hwraid resource type that is named rac_hwraid.