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 you 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.
Before you begin
- Understand the concepts that are described in the topic Core group discovery and failure detection protocols.
- Verify that you are using the default Discovery and Failure Detection
providers. If you 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.
About this task
Use the administrative console or the wsadmin tool to
adjust this setting if it is not appropriate for your environment
unless you are running in a mixed cell environment that includes core
groups that contain a mixture of Version 7.0 and Version 6.x processes,
Mixed-version environment: If you are running in a mixed
cell environment, and you have core groups that contain 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:
- In the administrative console, click core_group_name. Then, in the Additional Properties section,
click .
- In the field,
specify IBM_CS_UNICAST_DISCOVERY_INTERVAL_SECS, and specify a new time interval in the field.
mixv
To use the administrative console to change the wait
interval for the default Discovery Protocol, complete the following
steps.
Procedure
- In the administrative console, click core_group_name.
- In the Additional Properties section, click . The 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 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.