Plan maintenance windows
You should plan to perform the cluster migration in several phases.
First phase
You can perform the tasks in Step A: Get ready outside of a maintenance window.
Second phase
Perform the following tasks in one or more maintenance windows. The number of windows depends on the number of nodes you can complete in one maintenance window.
Remaining phases
Perform all the following tasks on several maintenance windows.
Follow these rules:
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Perform step C in one window, and perform step D in the next window. Or combine steps C and D in one window.
You could also perform step D outside of a maintenance window (but before you perform step E). You can do this because node X is no longer active — it's not part of the working cluster.
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Perform step E on as many nodes as you can in one maintenance window. In each window, you remove one or more workers nodes from the original cluster and put them in the new cluster. Eventually, all the worker nodes will be in the new cluster.
A consideration when you decide which worker nodes to migrate at the same time is whether you have routers in the cluster. Identify all worker nodes that use the SDI inputs attached to the router. Then plan to migrate those worker nodes together. After you've migrated all those nodes, you will be able to reconfigure the new cluster for that router.
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Then perform step F in one window, and step G in the next window. Or combine steps F and G in one window.
You could also perform step F outside of a maintenance window (but before you perform step G). You can do this because node Y is no longer active — it's not part of the working cluster.
