/BACKGROUND [= {DELAY:OpenVMS_delta_time | RETRY:n}]

    Optional. Defaults:

    o  If you omit this qualifier, background mode mounting is not
       attempted.

    o  If you omit the DELAY keyword, background mode mounting is set
       up with /BACKGROUND=(DELAY:00:00:30,RETRY:10).

    This qualifier enables background mode for mounting the file
    system.

    The optional DELAY time specifies amount of time to wait if
    the mount attempt fails before trying again. Specify the
    time as hh:mm:ss. The maximum delay period you can specify is
    approximately 49 days. The default delay time is 30 seconds.

    The optional RETRY keyword specifies the number of times to
    repeat the attempt to mount the file system. RETRY:0 means that
    the client uses the first try only. The default number of times
    to retry is 10.

    If you use the /BACKGROUND qualifier, you must also use the
    /RETRIES qualifier and specify a nonzero value. For example:

    $ TCPIP MOUNT DNFS0: /BACKGROUND=RETRY:9 /RETRIES=4 /HOST="robin" -
    _$  /PATH="/USR/USERS/GEORGE"

    In this example, you are asking for four data retries on each
    mount attempt and nine mount attempts, for a total of 36 tries.
    If you use the default value for /RETRIES, the first mount
    attempt can never complete except by succeeding, and the process
    doing the mount will hang until the server becomes available.