Server load balancers spread incoming traffic across multiple servers so no single machine carries a workload alone: appliances and modules that distribute connections for web, application, and database tiers, keeping a service responsive and available even if one server in the pool fails or needs maintenance. Where uptime and consistent response time matter, load balancing is the layer that delivers it.
Specify by the traffic pattern and the applications behind it - throughput, connection count, and supported load-balancing methods all need headroom for peak demand, not average demand. Confirm the balancer's health-check and failover behavior actually matches how the application pool should respond to a failed server, since a load balancer that does not detect failure quickly defeats its own purpose. For anything handling encrypted traffic, check whether the appliance offloads that work or simply passes it through. COLAMCO supplies load balancing hardware for the server and application infrastructure business, government, and education organizations run.