/sys$common/syshlp/DEFRAGMENT.HLB
DEFRAGMENT, VOLUME, Qualifiers, /CPU_LIMIT
 *Conan The Librarian 

       /CPU_LIMIT=n
       /NOCPU_LIMIT

          The /CPU_LIMIT qualifier specifies the percent of
          CPU resources to be used for any one defragmentation
          process. If this percentage is exceeded, the priority
          for the process drops to the minimum, as specified by
          the /PRIORITY qualifier, or defaults to three.
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