Starting with VSA 5.1, the VC can be on a different subnet than the VSA cluster.
You do need to have a 3rd cluster member on the local subnet but that does not need to be a full VSA host. It only needs to run the VSA Cluster Service to, among other things, serve as a tiebreaker in host failure cases. The Cluster Service can run on any 64 bit physical host or virtual machine running Windows or Linux. The VM can not be on either of the cluster nodes. We tested it with a low cost (~$200) PC
Thanks for the info! Another question, the documentation says that the configuration has to be the same. Is that set in stone? Does it need to be identical? For example, we have a poweredge r710 and a poweredge 2950. One has 1.5TB and the other has about 3.5TB, is it possible to just partition the available space? The memory amount is slightly different as well (about 8 MB difference, probably just a system difference in reading the memory) and the CPU speed is slightly different (still same number of cores, but about .5GHz difference)