There are Local file systems, Distributed (or network) file systems, and Parallel (or cluster) file systems used in cluster systems.

• Comprehend that Local file systems can be provided on nodes that are equipped with disks but only the node itself can access its disk.
• Comprehend that Local file systems are useful for (heavy) scratch I/O because the I/O performance scales perfectly with the number of nodes.
• Comprehend that there are also disadvantages of using Local file systems:
  • For an overall view data has to be collected from all the nodes it is stored on.
  • Disks are a major source of failures (so many clusters have diskless nodes).