There are a couple of options available, depending on what you have available in your environment.
- Are you using a disk management software like Symantec Veritas Volume Manager? Products like this will allow you to dynamically move volumes from one system/DC to another.
- are you sharing the entire EM filesystem between Production DCs and DR, or just a subset of subdirectories?
- Is your secondary DC just a hotfailover or is it Active/Active?
Already, I see from your description that you could have a potential data loss issue if your DC setup is Active/Active. You cannot easily combine that performance data from SmartStor from two EMs to one. That takes a lot of time, depending on their sizes.
Answering some of these questions in detail will help us to provide you with better answers to your needs.
-Hiko