What is a requirement for the network connection between replication partners for synchronous replication?

For synchronous replication, maintaining a low latency is critical to ensure that data is consistently written to both the primary and secondary locations without delay, thus guaranteeing data integrity and availability. A requirement of less than 5 ms latency on the network link is appropriate because it allows for quick acknowledgment of data writes between the replication partners.

If latency exceeds this threshold, the performance can be negatively impacted due to delays in data propagation, leading to potential bottlenecks and affecting the ability to maintain real-time synchronization. Therefore, a latency requirement of under 5 ms ensures that the network can handle the demands of synchronous replication effectively, leading to minimal disruption and maintaining the expected performance levels.

The emphasis on latency, as opposed to bandwidth, highlights the critical nature of timely data synchronization over sheer volume of data transfer, which is why this specific metric is essential for synchronous replication configurations.