7.1 Distance and Latency Considerations
The link between the customer’s on-premises data center and the VMware Cloud Provider facility is a significant factor in this solution architecture. Therefore, when designing a high availability and disaster recovery solution, it is important to understand factors such as link capacity, latency, and use. Typically, network latency corresponds to distance. Round-Trip Time (RTT) can vary from 0 ms to 250 ms or higher. The following table provides distances and their corresponding link latencies. Note that the values shown here are estimates and can vary significantly depending on interconnect quality, network hops, and physical infrastructure.
Table 3. Distance and Estimated Link Latency
Approximate Distance | One-Way Latency (ms) | Round-Trip Latency (ms) |
50 km | 0.25 | 0.5 |
500 km | 2.5 | 5 |
1,000 km | 5 | 10 |
5,000 km | 25 | 50 |
10,000 km | 50 | 100 |
20,000 km | 100 | 200 |
22,500 km | 125 | 250 |
Verify that the design follows Microsoft Exchange Server guidelines for latency and that the required interconnect capacity requirements are known when evaluating connectivity options for the solution.