I've seen a few references to using VPLEX Metro within a data center to provide better availability guarantees than what VPLEX Local can provide.  However, I was thinking why can't you just do this with VPLEX Local by scaling it out to 4 engines and putting the engines in different racks?   If I'm within a data center, it would be relatively simple to have these connected via Fibre Channel, which I assume is how they interconnect anyway?    Is there some requirement for VPLEX Local that a multi-engine cluster has to be within the same rack or within 10-15 meters of each other like a Symm cabinet? 

Thanks,

Dan