If core groups that are in the same cell need to share workload
management (WLM) information, then you must configure these core groups to
communicate.
Before you begin
Create the core groups for your cell. Configure all of the processes
within the core groups, including your servers and clusters.
About this task
You might configure multiple core groups for a cell in the following
scenarios:
- One or more firewalls exist within a cell. A core group cannot contain
members from multiple firewall protection domains.
- A large number of processes in the cell and the core group protocols,
such as the View Synchrony Protocol, consume correspondingly large amounts
of resources, such as processor resources.
- Core group protocols, such as the Failure Detection Protocol, need tuning
or configuring to use values that work best with smaller numbers of core group
members.
With WebSphere
® Application
Server Network Deployment, a number of steps are required to configure this
communication, including configuring bridge interfaces and core group access
points. With WebSphere Extended
Deployment, this configuration is simplified because these required elements
are automatically configured.
Procedure
- Create the core groups for your cell.
- Add node agents and servers to each core group. Configure
at least two node agents for each node group to ensure high availability.
On process startup, if core group bridges have not already been
configured, then every WebSphere Extended Deployment process automatically
configures a core group access point for each configured core group. WebSphere Extended
Deployment assumes that each of the node agents in each core group is a core
group bridge. The configuration is modified to make each node agent a core
group bridge. You might have to restart the processes again for this configuration
to complete.
- Start the node agents. As long as two or more node agents
per core group are running, the core groups can communicate.
Results
Core groups that are in the same cell can communicate and share WLM
information.