Configure the default Discovery Protocol for a core group

The default Discovery Protocol for a core group establishes network connectivity between a new core group member and the other members of that core group. Perform this task if we need to tune the default Discovery Protocol behavior for a core group. The default value of 60 seconds, which is set by the product installation process, provides an acceptable process detection time for most situations.

• Understand the concepts described in the topic Core group discovery and failure detection protocols.

• Verify that you are using the default Discovery and Failure Detection providers. For an alternative protocol provider, do not perform the steps in this task because these steps only apply if you are using the default discovery and failure detection providers.

• Determine how long we want the default Discovery Protocol to wait before it recalculates the set of unconnected core group members, and attempts to open connections to those members.

Use the console or wsadmin.sh to adjust this setting if it is not appropriate for the environment unless you are running in a mixed cell environment that includes core groups containing a mixture of Version 7.0 and Version 6.x processes,

Mixed-version environment: If we are running in a mixed cell environment, and we have core groups containing a mixture of Version 7.0 and Version 6.x processes, you must continue to use the IBM_CS_UNICAST_DISCOVERY_INTERVAL_SECS core group custom property to adjust how frequently the default Discovery Protocol attempts to open a new network. To specify this custom property:

1. In the console, click Servers > Core Groups > Core group settings > core_group_name. Then, in the Additional Properties section, click Custom properties > New.

2. In the Name field, specify IBM_CS_UNICAST_DISCOVERY_INTERVAL_SECS, and specify a new time interval in the Value field.

mixv

To use the console to change the wait interval for the default Discovery Protocol...

1. In the console, click Servers > Core Groups > Core group settings > core_group_name.

2. In the Additional Properties section, click Discovery and failure detection. The Use the default protocol providers option must be selected. If this option is not selected, do not perform any more of the steps in this task.

3. Specify a new value for the Discovery period property.

   Decreasing this time interval might improve the detection of core group members.

4. Click OK and then click Review.

5. Select Synchronize changes with nodes, and then click Save.

6. Restart all members of the core group.

Results

After the servers restart, the core group members all run with the new Discovery Protocol setting.

Subtopics

• Discovery and failure detection settings
  Use this page to configure the discovery and failure detection settings for a core group. These settings are used to monitor the health of core group members. The discovery protocol establishes network connectivity between core group members of the core group. The failure detection protocol monitors the established network connections. Both the default discovery protocol and the default failure protocol run at regularly scheduled intervals on all started core group members.

Related concepts

Core groups (high availability domains)

Core group discovery and failure detection protocols

Core group protocol versions