Invokes the Disk File Optimizer. This utility is a layered
    product that restores file contiguity while the target volume
    remains on line and accessible. The Disk File Optimizer is
    compatible with any Files-11 structure level two (ODS-2)
    formatted volume including single volumes, bound volume sets,
    stripe sets or shadow sets. The file defragmentation utility
    is also compatible with ODS-5 formatted device on OpenVMS Alpha
    7.2-1 and above.

    Format

      DEFRAGMENT  [ /INTERFACE ]

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