We are planning to migrate the production VMs from one of our datacenters, based on ESXi 5.5 hosts, to a new datacenter with 6.5 environment. Datacenters are located in different places.
So our production consists of near 150 VMs. I've set the network connection and tried VMware converter to transfer a couple of test VMs, but the migration performance wasn't well. I can't set up the replication due to limited access to the network between the datacenters. We do not have anyone to perform that, cause the guy who maintained the datacenter left the company, and I need to do it myself.
Are there another options how to migrate? Are there also some restrictions in migrating from 5.5 to 6.5?