Selecting the version of a core group protocol

For a large cell, multiple coordinators are recommended.

The high availability manager, by default, uses the original or base 6.0.0 protocol version. Before you upgrade to a newer protocol version, you should make sure that:

Before you change the version of the core group protocol for a particular core group member, make sure that:

• You are familiar with the content of the "Core group protocol versions" topic.

• All core group members with which the new version is associated can support that version. Each member of the core group must be running at a WebSphere Application Server code level (VRM) that is equal to or greater than the new protocol version.

Overview

The high availability manager can use any supported core group protocol versions. However, to ensure that proper communication continues between all core group members, make sure that all member of a particular core group use the same version of a core group protocol.

To change the version of a core group protocol:

Procedure

1. In the administrative console, click Servers > Core groups > Core group settings and select an existing core group.

2. Under Additional Properties, click Custom Properties.

3. Change the value specified for the IBM_CS_WIRE_FORMAT_VERSION custom property.

   If the IBM_CS_WIRE_FORMAT_VERSION property already exists, click on the property name, and specify the appropriate version ID in the Value field.

   If this property does not already exist, click New and then specify IBM_CS_WIRE_FORMAT_VERSION in the Name field and the appropriate version ID in the Value field.

   The following table lists the supported core group protocol version IDs:

   Protocol version ID	Description
   6.0.0	This is the original or base version. All versions of the high availability manager can use this protocol. If you do not specify a particular protocol version the high availability manager uses this version.
   6.0.2.9	This version was included in the V6.0.2.9 service pack to facilitate core group bridge scalability. This version is recommended for large topologies that contain multiple core groups and core group bridges as part of their configuration.
   6.1.0	This version was included in V6.1 to add core group scalability improvements, and more support for large topologies.

4. Click OK and then clickReview.

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

Results

Related concepts

Related tasks

Related Reference