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 we are using the default Discovery and Failure Detection providers. If we are using an alternative protocol provider, do not perform the steps in this task because these steps only apply if we 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 administrative console or the wsadmin tool to adjust this setting if it is not appropriate for the environment unless we are running in a mixed cell environment that includes core groups that contain a mixture of v7.0 and v6.x processes,
Mixed-version environment: If we are running in a mixed cell environment, and we have core groups that contain a mixture of v7.0 and v6.x processes, we 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:
- In the administrative console, click...
- Servers > Core Groups > Core group settings > core_group_name > Additional Properties section > Custom properties > New
- In the Name field, specify...
... and specify a new time interval in the Value field.
mixv
Change the wait interval for the default Discovery Protocol
- In the administrative console, click...
- Servers > Core Groups > Core group settings > core_group_name > Additional Properties > 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.
- Specify a new value for the Discovery period property.
Decreasing this time interval might improve the detection of core group members.
- Click...
-
OK > Review > Synchronize changes with nodes > Save
- Restart all members of the core group.
After the servers restart, the core group members all run with the new Discovery Protocol setting.
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