/CACHE_TIMEOUT=
    [ DIRECTORY:OpenVMS_delta_time ]
    [ ATTRIBUTE:OpenVMS_delta_time ]
    [ READ_DIRECTORY ]

    Optional. Defaults:

    If you omit this qualifiier, the file system is set up with
    caching timeouts as follows:

    /CACHE_TIMEOUT=(DIRECTORY:00:00:30,ATTRIBUTE:00:00:15)

    Specifies the following caching timeout information for the mount
    point:

    o  DIRECTORY:OpenVMS_delta_time              [00:00:30]

       -  Amount of time that the client waits between rereading a
          directory's status or contents.

       -  Specify OpenVMS_delta_time as hh:mm:ss.

    o  ATTRIBUTE:OpenVMS_delta_time              [00:00:15]

       -  Amount of time that the client waits between rereading a
          file's attributes from the NFS server.

       -  Specify OpenVMS_delta_time as hh:mm:ss.

    o  READ_DIRECTORY

       -  Forces the client to read the contents of the directory
          requested when the cache timeout occurs rather than rely on
          the directory's modified time.

       -  By reading the directory contents, the client can be aware
          of any changes to the number of files within the directory,
          even if the directory's modify time was not updated.