/sys$common/syshlp/DEFRAGMENT.HLB
DEFRAGMENT, VOLUME, Qualifiers, /IO_LIMIT

 *Conan The Librarian

       /IO_LIMIT=n
       /NOIO_LIMIT

          The /IO_LIMIT qualifier specifies the maximum direct
          I/O rate (per second) of any one defragmentation
          process. If the I/O rate is exceeded, the priority
          for the process drops to the minimum priority as
          specified by the /PRIORITY qualifier or defaults to
          three.
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