Why should the two of each component be located at the London datacenter?

While London might be a failover target for other datacenters, having two of each component within London primarily ensures high availability for London's own services and internal resilience, not just its role as a failover destination.

Locating two of each component, such as NetScaler Gateways and StoreFront servers, at the London datacenter provides high availability and fault tolerance for secure remote access services. This redundancy ensures that users can continuously access their resources securely, even if one instance of a component fails.

Having two components in a datacenter primarily aims for high availability and fault tolerance, not necessarily a direct increase in user performance, although load balancing across them can distribute load and maintain performance under heavy usage.

Deploying two of each component in London does not inherently lead to centralized management; rather, it typically involves managing redundant components within that specific site.