How to run a test WordPressMu to WordPress3 update?

In this situation, I’d recommend the following:

  1. Dump your production database into your test database
  2. Install WP 3 and point it at your test DB
  3. Run the database upgrade
  4. Turn users loose on the test instance

We used a similar process on a much larger installation, and it worked fairly well. Having the second instance made it possible to use our testing resources to verify functionality without depending on the users, too.

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