If a cluster gets divided into multiple sub-clusters due to lack of communication between cluster nodes, the cluster gets partitioned.
What is a computer cluster?
A cluster is a collection of linked computers or hosts that cooperate to provide middleware and applications (e.g. databases). Every computer in a cluster is referred to as a "node." In contrast to grid computers, where each node carries out a unique work, computer clusters assign each node the same task. High-speed local area networks are typically used to connect the nodes in a cluster to one another. Operating systems are run independently on each node. High availability and cost-effective high-performance computing (HPC) are two common uses for computer clusters (HA).
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