In a software-defined network, the data plane handles packets under the direction of a control plane, but the controllers are just applications that can run on standard x86 hardware. SDN controllers use a standard protocol (OpenFlow) to communicate with data plane devices. Other specialized network appliances -- like firewalls and load balancers -- that get recast as SDN applications also run on standard x86 hardware using the SDN controller to get the data plane devices to do what they need to do.
A testator must be of sound mind when making a will. In part to ensure that a testator is of sound mind, states require that the signing of a will be witnessed by multiple persons. A testator also should be making the will without duress and free of coercion from other persons.
What is RAID controller? RAID controller, as the name implies, is used for controlling a RAID array. It is the device for managing the physical disk drives for maintaining their functions. RAID controllers also work to control the disks in the RAID so that they work as the logical unit. A RAID controller works towards helping the device to act on RAID recovery.