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===Data sharing===
[[File:Nec-cluster.jpg|thumb|A [[NEC]] [[Nehalem (microarchitecture)|Nehalem cluster]]]]
As the computer clusters were appearing during the 1980s, so were [[supercomputer]]s. One of the elements that distinguished the three classes at that time was that the early supercomputers relied on [[Shared memory architecture|shared memory]]. To date, clusters do not typically use physically shared memory, while many supercomputer architectures have also abandoned it.
However, the use of a [[clustered file system]] is essential in modern computer clusters.{{Citation needed|date=August 2013}} Examples include the [[IBM General Parallel File System]], Microsoft's [[Cluster Shared Volumes]] or the [[Oracle Cluster File System]].
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