This section deals with migrating clusters when you are thinking of installing WebSphere® MQ Version 6.0 on an IPv6 capable network.
The following gives an overview of approaches that can be taken when migrating a cluster to WebSphere MQ Version 6.0. Due to the variations that can occur within a cluster, the detail is deliberately general and should only be seen as a guide to the likely course of action you will need to take.
Where an IPv6 capable system is to be added to a WebSphere MQ cluster, all full repository systems in that cluster must be IPv6 capable.
The following scenarios are seen as the ones most likely to occur in customer installations. They describe the likely changes that will be required.
When adding a new IPv6 only system to the cluster, identify those queue managers that your new system will communicate with. These include:
The systems that you have identified must be upgraded before introducing the new system.
Recommended migration procedure:
With this configuration:
A WebSphere MQ Version 5.3 or earlier cluster is installed on IPv4 only capable systems and you need to connect an IPv6 only capable system into the cluster. Your network does not support adding both IPv6 and IPv4 addresses using the same hostname or alternatively you may be using IP addresses rather than DNS names in the cluster channel CONNAMEs.
The problem here is likely to be that all of the systems cannot be switched to IPv6 simultaneously and some at least must remain only IPv4 capable. The systems that your new IPv6 only system communicates with must be IPv4 and IPv6 capable. We do not recommend simply adding a new set of IPv6 channels into the cluster for the IPv6 system to use, as the IPv4 system would also try to use them, resulting in communication errors.
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