Migrating Servers to New IP's

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We are approximately 10 days away from migrating to a new upstream provider, and have a few Plesk boxes that will be affected. I am curious if those long time users can point out some "lesson's learned" on what less obvious changes within plesk need to be done while this migration is being performed.

We have considered Mirroring the drives, but that seems like a waste of hardware and a lot of extra work, but may save a lot of grief in the process.

Your comments are appreciated.