Changing IP addresses in disaster recovery configurations

If you change the IP addresses of either or both of the eth20 ports of the appliances in a disaster recovery configuration, replication is no longer possible between the two appliances. Other changes to the eth20 interface on either appliance could stop high availability (HA) queue managers that also have DR enabled from running.

If you need to change IP addresses, you must use the following procedure:
  1. Remove the disaster recovery (DR) configuration on both appliances. You remove DR by removing both primary and secondary queue managers from DR control, see Removing a queue manager from a disaster recovery configuration by using the command line.
  2. Allocate new IP numbers to the two eth20 ports as required, observing the requirement that the addresses are on the same, dedicated subnet. See Configuring Ethernet interfaces by using the command line.
  3. Re-create the DR configuration by configuring the queue managers as described in Configuring queue managers for disaster recovery by using the command line.

You can also use the IBM® MQ Appliance web UI to perform these operations. Follow the related links for details.

If you find that your HA/DR queue managers do not run, and you receive an error message indicating that the queue manager has failed due to a problem with a resource, then you must undo the changes that were made to eth20 before you can restart the queue managers by using the strmqm command. Alternatively, you can delete the queue manager or remove the disaster recovery configuration from it.