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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   cluster
   clustering
      1. <architecture> Multiple servers providing the same
      service.  The term may imply resilience to failure and/or
      some kind of load balancing between the servers.  Compare
      RAIS.
      2. <file system> An elementary unit of allocation of a disk
      made up of one or more physical blocks.
      A file is made up of a whole number of possibly
      non-contiguous clusters.  The cluster size is a tradeoff
      between space efficiency (the bigger is the cluster, the
      bigger is on the average the wasted space at the end of each
      file) and the length of the FAT.
      (1996-11-04)