(1) A collection of complete systems that work together to provide a single, unified computing capability.
(2) In SNA, a group of stations that consist of a controller (cluster controller) and the workstations attached to it.
(3) In high-availability cluster multiprocessing (HACMP), a set of independent systems (called nodes) that are organized into a network for the purpose of sharing resources and communicating with each other.
(4) In WebSphere MQ, a group of two or more queue managers on one or more computers, providing automatic interconnection, and allowing queues to be shared amongst them for load balancing and redundancy.
(5) In Microsoft Cluster Server, a group of computers, connected together and configured in such a way that, if one fails, MSCS performs a failover, transferring the state data of applications from the failing computer to another computer in the cluster and reinitiating their operation there.
(6) A data set defined to VSAM. A cluster can be a key-sequenced data set, an entry-sequenced data set, or a relative record data set.
(7) A group of application servers that collaborates for the purposes of workload balancing and failover.
(8) A group of two or more Domino servers that provides users with constant access to data, balances the workload among servers, improves server performance, and maintains performance when the size of an enterprise increases.
(9) A loosely coupled collection of independent systems (or nodes) organized into a network for the purpose of sharing resources and communicating with each other. See also GPFS cluster.