Part of the design around pod support in the FlashArray SRA is to allow for the easy and non-disruptive migration of a pod from one physical FlashArray to another without breaking recovery plans. Moving a pod can be considered any one of the following operations:
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Stretching a currently unstretched pod to a second FlashArray
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Unstretching a stretched pod from a FlashArray
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Stretching a currently unstretched pod to a second FlashArray AND then unstretching from the original (moving a pod).
In all of these cases, the advice is the same. Prior to making any kind of ownership changes to a pod, you should make sure that the FlashArrays are all already configured in the SRM array managers as mentioned above.