Network Deployment (Distributed operating systems), v8.0 > Establishing high availability

Create a new core group (high availability domain)

A default core group, called DefaultCoreGroup, is created for each cell. This default core group or high availability domain as it is sometimes referred to, is sufficient in most configurations. However there are some circumstances under which create additional core groups for a cell.

Determine how to segment your existing cell into multiple core groups. Use the following rules as guidelines:

You should also try to keep your core groups homogeneous. If your installation topology requires you to set up a mix of processes that use and do not use the high availability manager, you can:

bprac You might want to add another core group to a cell if you are scaling up the number of servers in a cell. Multiple core groups are recommended for a large cell.

To create a new core group:


  1. In the admin console, click...

        Servers > Core Groups > Core group settings > New .

  2. In the Name field, specify a unique name for the new core group. The name can contain alpha and numeric characters, but not the following special characters:
    #  \  /  ,  :  ;  "  *  ?
    <  >  |  =  +  &  %  '
    The name also cannot begin with a period (.) or a blank space. A blank space does not generate an error. However, leading and trailing blank spaces are automatically deleted from the name.

  3. Add a description of this core group that helps other administrators understand the purpose of this core group.

  4. Click OK and then click Review.

  5. Select Synchronize changes with nodes, and then click Save.


The cell contains another core group.

What to do next

We must now:

Core groups (high availability domains)
High availability manager
Specify a core group when adding a node
Specify a core group when creating an application server
Move core group members
Configure a core group transport
Configure the default Discovery Protocol for a core group
Configure the default Failure Detection Protocol for a core group
Configure core group memory utilization
Configure core group IP caching
Configure core group socket buffers
View the core groups in a cell
View core group members
Change the number of core group coordinators
Configure core group preferred coordinators
Set up a high availability environment


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