When IBM brought out the SAN Volume Controller (SVC) in 2003, the goal was clear: support as many storage vendors and products as possible. Since then IBM has put a huge ongoing effort into interoperation testing, which has allowed them to continue expanding the SVC support matrix, making it one of the most comprehensive in the industry. When the Storwize V7000 was released in 2010 it was able to leverage that testing heritage, allowing it to have an amazingly deep interoperation matrix on launch date. It almost felt like cheating.
However I recently got challenged on this with a simple question: Where is the VNX? If you check out the Supported Hardware list for SVC V6.3 or Storwize V7000 V6.3 you can find the Clariion up to a CX4-960, but no VNX.
The short answer is that while the VNX is not listed there yet, IBM are actively supporting customers using VNX virtualized behind SVC and Storwize V7000. If you have a VNX 5100, 5300, 5500, 5700 or 7500 then ask your IBM pre-sales Technical Support to open an Interoperation Support Request. The majority are being approved very quickly. The official support sites that I referenced above will be updated soon (but don't wait, if you need support, ask for it). IBM is working methodically with EMC to be certain that when a general publication of support is released for VNX (soon!), both companies will agree with the published details.
And for the wags who think that this is a ringing encouragement to buy VNX, you would be missing the point. You cannot be a serious Storage Virtualization vendor if you are not willing to support your clients purchasing decisions, regardless of which vendor they buy their storage from. IBM have been staying that course and demonstrating that willingness since 2003. It's a pretty good track record and one that they are determined to maintain.