For maximum availability in a datacenter design, which technique should be implemented for caching user information requests?

Implementing the Active/Active technique for caching user information requests in a datacenter design contributes to maximum availability by allowing multiple nodes or servers to handle requests simultaneously. This approach ensures that if one node fails or becomes unavailable, the other nodes continue to operate without interruption, thus maintaining service availability and performance.

In an Active/Active configuration, each server actively processes requests and can share the load, which not only enhances performance but also provides redundancy. This means that the workload is balanced across all active nodes, reducing the risk of overloading any single server and allowing for seamless failover. The continuous operation of all nodes also helps in quick recovery since users can be redirected to other active servers if one encounters issues.

By contrast, other techniques such as Active/Passive involve one server being active while the other is on standby, which doesn't utilize resources effectively and may introduce a delay when switching to the standby server in case of failure. This could lead to service disruptions, which is contrary to the goal of maximum availability.