Reversing the migration of messages by using the message migration utility

You can use the message migration utility to reverse migrate messaging from the default messaging provider (the service integration bus) on an application server at the current version of the product to the Version 5 embedded messaging provider on a Version 5.1 application server. Reverse migration is carried out under XA coordination.

Before you begin

You must reverse the migration of the messages before deleting the application server on the service integration bus.

About this task

You run the message migration utility only once for a particular queue, unless a failure occurs.

If a failure occurs during message migration, it is safe to run the message migration utility again in the same direction because messages are moved rather than copied. Whether you successfully try a failing message migration again, or delete the message, the message ordering of the remaining messages is preserved on the queue on the current version of the product.

If the reverse migration takes place after a partial migration from WebSphere® Application Server Version 5.1 to a later version, in which only some of the messages were migrated, then the message ordering is not preserved. However, if the target queue in the Version 5.1 application server is empty when the migration takes place (as it is likely to be) then the message order is retained.

Messages that are reverse-migrated appear on the queue after those that were not migrated at the first attempt.

Procedure

  1. Follow the actions indicated by the message migration utility.
  2. On the "Select the direction of migration" panel choose Reverse a previous migration.

Results

As in normal migration, if a queue has a failing message you have the choice of:
  1. Trying the failing message again, in case there is a transient error.
  2. Deleting the failing message and going on to the next message.
  3. Stopping the queue that has the failing message and moving on to the next queue.
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Last updated: Oct 21, 2010 7:37:48 AM CDT
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