Dynamic resource load balancing (DRLB) is the automatic balancing of resource usage across multiple ESX Servers. DRLB ranges from simply scripting of VMotion to moving a VM from host to host through the automatic assignment of more resources on-the-fly, while the VM is running. In addition, DRLB is also referred to as business continuity. It is the front line of any disaster prevention and recovery process and the basis for forming an ESX Server cluster. Although DRLB covers a wide range of functionality, it can be broken down into various business continuity processes, some of which require creative scripting to accomplish and others of which exist in various VMware and third-party tools.