(n.) Ability of a service component to scale within a single instance of an operating system. Typically, a vertically scalable service component provides increased capacity and performance in direct proportion to the number of processors available to it within an operating system instance. These service components are typically tightly coupled, and the data or workload they run is not easily partitioned. They usually run as a single instance at any given time and require HA software to provide failover in the event of failure.
See also [high availability or highly available (HA)]
See also [horizontal scaling]
(abb.) Virtual IP, as in virtual IP address
(n.) Adding a layer of software onto some entity so that the new entity exhibits the interface properties of the original. This layer hides the true implementation of the virtualized object so that the original can be changed or replaced without fundamentally impacting the interaction of entities that have a dependency. For more information, see "Virtualization" on page 24.