VPLEX with VIAS and XtremIO

Hello,

In anticipation of going to 5.5, I had a couple questions I was seeking clarification to with regards to ensuring best practices are met for XtremIO and VPLEX integration. From reading some of the guides and training manuals, the following questions don't seem to be called out so I wanted to validate:

1. The docs stats that each XtremIO is registered to the VPLEX cluster in a 1:1 fashion and that multiple XtremIO arrays have to be registered separately. This is OK, but what is the limitation around an XMS managing multiple XtremIO clusters today? Do I have to revert the XMS consolidation back to a legacy 1:1 mapping of XMS to XtremIO array if I want to have more than 1 XtremIO cluster registered with the VPLEX? It seems that way and this seems counter-productive to consolidating XMS's so I wanted to validate if there was a way to utilize a multi-cluster XMS with VIAS or if I had to go back to 1:1 and re-deploy XMS's to make them 1:1 again?

2. Is there a hard requirements to have ONLY a SINGLE IG created with all VPLEX BE ports on it registered in the XtremIO array or can VIAS operate when the VPLEX is registered using multiple IG's?

Thanks,

-Keith