/VOLUME_CHARACTERISTICS=([[NO]HARDLINKS,] [[NO]ACCESS_
       DATES[=delta-time]])

    Enables or disables hardlinks and automatic updates of access
    dates on ODS-5 volumes.

    To limit the performance impact if a file is accessed frequently,
    you can suppress update of the access time if the change is
    small. A delta time is used to determine when a new access time
    is significant. The default value for delta-time is 1 second,
    chosen to comply with the "seconds since EPOCH" time interface
    required by POSIX st_atime. A site can choose a larger delta time
    to reduce overhead if 1-second granularity is not required.

    To disable access date support on a volume, use the SET
    VOLUME/VOLUME_CHARACTERISTICS=NOACCESS_DATES command. This
    command affects only the node on which the command is issued.
    Other nodes are not affected by the change until the next time
    the volume is mounted.