Red Hat® Enterprise Linux® High Availability Add-On allows a service to fail over from 1 node to another with no apparent interruption to cluster clients, evicting faulty nodes during transfer to prevent data corruption. This Add-On can be configured for most applications (both off-the-shelf and custom) and virtual guests, and supports up to 16 nodes. The High Availability Add-On features a cluster manager, lock management, fencing, command-line cluster configuration, and a Conga administration tool.