The Cixco HX platform uses full dynamic data distribution. This means that data is evenly striped across all nodes within the storage cluster, thus data is at maximum one hop away from the VM. Nodes are connected to each other through the low latency Cisco Fabric Interconnect (FI) network.
Whether data locality is a good or a bad thing has turned into a philosophical debate. Its true that data locality can prevent a lot of network traffic between nodes, because the data is physically located at the same node where the VM resides. However, in dynamic environments where VMs move to different hosts on a frequent basis, data locality in most cases requires a lot of data to be copied between nodes in order to maintain the physical VM-data relationship. The SDS/HCI vendors today that choose not to use data locality, advocate that the additional network latency is negligible.