I'm looking for information on how VPLEX Geo functions and seem to be coming up with slim pickings.  I understand metro and synchronous replication, but am very unclear on the async replication functions and how they work.  Also very unclear on how the data access works in the async world...as in what happens if a host at SiteA writes a data block and half a second later a host at SiteB tries to read that block.

Can someone point me at some whitepapers or guides on VPLEX Geo and how it functions?