Reversing the migration of messages using the WebSphere message migration utility

This topic describes how to reverse the results of the WebSphere® message migration utility.

Before you begin

If you want to revert to using WebSphere Application Server Version 5, instead of WebSphere Application Server Version 6, you must reverse the migration of the messages before deleting the WebSphere Application Server Version 6 server.

About this task

Reverse migration is carried out under XA coordination.

If the reverse migration takes place after a partial migration from WebSphere Application Server Version 5 to WebSphere Application Server Version 6, in which only some of the messages were migrated, then the message ordering will not be preserved. However, if the target queue in the WebSphere Application Server Version 5 is empty when the migration takes place (as it is likely to be) then the message order will be retained.

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

Note:
  1. You run the message migration utility only once for a particular queue, unless a failure occurs.
  2. 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 WebSphere Application Server Version 6 queue.

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 updatedLast updated: Aug 30, 2013 6:03:36 PM CDT
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