We have a WAN network that connects 15 locations. 14 of the 15 locations are 1.5Mbps T1, and one is MetroEthernet 10Mbps. The connections all physically come together at the phone company via NetVPN. Here is the scenario we have: One server at the MetroE site connected at 10Mbps, we'll call it Site A, is connected to a switch via gigabit. The switch then connects to the MetroE link to go out over the WAN. At one of the T1 1.5Mbps sites at the other end, we'll call it Site B, we have 15 servers and 30 PCs. Most servers are on gigabit there. If we have to backup 6GB of data from Site A to Site B, it is argued by a co-worker that the backup will finish sooner if the servers at each end are running at gigabit speed, and not 100Mb speed on the switches. Another co-worker says that as long as there is at least one T1 1.5Mbps WAN link line involved between these two servers, it will not make any difference if they are gigabit or 100MB on each LAN because the 1.5Mbps part of the connection is the bottleneck irregardless. In other words, data cannot travel any faster than the slowest bandwidth link involved between two computers. Any thoughts?
Thanks for input from all.