Why should the two NetScalers be located at the London datacenter?

Placing two NetScalers, often in an HA pair, in a central datacenter like London facilitates global server load balancing (GSLB) and disaster recovery strategies. This design allows traffic from other regions, such as New York and Hong Kong, to be redirected to the London datacenter if their local services become unavailable, ensuring continuous service access.

While NetScaler can provide secure remote access, its strategic placement across global datacenters is primarily driven by load balancing and disaster recovery capabilities for global resilience, not solely for secure access in a single region.

Simply having two components primarily enhances availability and redundancy, not necessarily increasing user performance across geographically dispersed locations in a failover scenario.

NetScalers can be managed centrally, but their physical location in a specific datacenter within a global setup is fundamentally determined by their role in traffic management, failover, and disaster recovery, not just management convenience.