A cell is comprised of one or more processes that each
host runtime components. Each cell has one or more named core groups.
A core group is a group of processes that are directly accessible
to each other and is connected using a local area network (LAN). 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.
The recommendation is a maximum of 40 WebSphere Application
Server Network Deployment related processes such as application servers,
node agents, and on demand routers defined in your core group.
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.
If you are using WebSphere
® Application Server
Network Deployment, you must configure bridge interfaces and core
group access points. In
WebSphere Extended Deployment, this configuration is simplified, because these required elements
are automatically configured.
Procedure
- Add node agents and servers to each core group. Configure at least two node agents for each node group to ensure
high availability. When a process starts if core
group bridges are not configured, then every product process automatically
configures a core group access point for each configured core group.
The product 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 need to restart the processes
again for this configuration to complete.
- Start the node agents. If 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.