Clustering involves deployment of multiple LoadMaster instances (nodes) as a single management and control domain where each node is actively passing traffic. If any of these nodes fail - the remaining nodes continue to provide service to the remote client, providing resilience.

Clustering supports scaling - LoadMaster nodes can be added to or removed from a cluster so that capacity can be dynamically adjusted to match business requirements. Each additional LoadMaster node which is added to the cluster can provide a linear increase in throughput and performance. The maximum number of nodes that can be added to a cluster is defined by your license agreement.

An example use case is - if a website experiences higher than usual traffic during a holiday period and the amount of traffic cannot be predicted in advance - often the capacity is over-provisioned to handle these requests that come in spikes. One of the simplest solutions is to deploy LoadMasters in a cluster and then add new nodes as the capacity requirements (concurrent connections and performance requirements) increase.