Most Veritas Cluster Server implementations attempt to build availability into a cluster, eliminating single points of failure by making use of redundant components like multiple network cards, storage area networks in addition to the use of VCS. High-availability clusters (HAC) improve application availability by failing or switching them over in a group of systems-as opposed to high-performance clusters, which improve application performance by running them on multiple systems simultaneously. It provides application cluster capabilities to systems running other applications, including databases, network file sharing, and electronic commerce websites. Veritas Cluster Server (rebranded as Veritas Infoscale Availability and also known as VCS and also sold bundled in the SFHA product) is a high-availability cluster software for Unix, Linux and Microsoft Windows computer systems, created by Veritas Technologies.
