As I know,the minimun software requirement of implementment of SRM 5 between site 1 and site. 2as below:
One vcenter 5,one SRM 5 in site 1
One vcenter 5, one SRM 5 in site 2
In SRM 5.1, is it new feature to support vsphere replication between hosts managed by a singe vcenter?
As you understand, do you mean that it is necessary to install same version of vCenter and SRM (e.g. 5.1) in both sites?