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<p><big>Data sharing</big></p>
<p>As the computer clusters were appearing during the 1980s, so were <a href="page.php?w=supercomputer">supercomputer</a>s. One of the elements that distinguished the three classes at that time was that the early supercomputers relied on <a href="page.php?w=Shared_memory_architecture">shared memory</a>. Clusters do not typically use physically shared memory, while many supercomputer architectures have also abandoned it.</p>

<p>However, the use of a <a href="page.php?w=clustered_file_system">clustered file system</a> is essential</p><p>
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