Network Deployment (Distributed operating systems), v8.0 > Establishing high availability > Configure core groups
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 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. If we are using 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 you 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 admin 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 v7.0 and v6.x processes,
Mixed-version environment: If you are running in a mixed cell environment, and we have core groups containing a mixture of v7.0 and v6.x processes, 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 admin console,
click...
Servers > Core Groups > Core group settings > core_group_name. Then, in the Additional Properties > Custom properties > New.
- 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 admin console to change the wait interval for the default Discovery Protocol, complete the following steps.
Procedure
- In the admin console,
click...
Servers > Core Groups > Core group settings > core_group_name.
- In the 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 and then click Review.
- Select Synchronize changes with nodes, and then click Save.
- Restart all members of the core group.
Results
After the servers restart, the core group members all run with the new Discovery Protocol setting.
Related
Discovery and failure detection settings
Core groups (high availability domains)
Core group discovery and failure detection protocols
Core group protocol versions
Set up a high availability environment