You should consider hardware write-protecting an EF/RF when:
• You want to write-protect an EF/RF ISE when the VMS operating system is
not available, such as before running the MicroVAX Diagnostic Monitor.
• You want to ensure that an EF/RF remains write-protected, since the
hardware write-protect cannot be removed by the VMS MOUNT command
and remains in effect even if the operating system is brought down.
You can hardware write-protect an EF/RF from VMS or through firmware
commands entered at the console prompt (
>>>
):
1. Access the Diagnostic and Utility Program (DUP) driver for the device you
want to write-protect.
• To access the DUP driver from console mode:
a. Enter console mode by pressing the Halt button or powering up
the system with the Break Enable/Disable switch set to enable (up,
position 1).
CAUTION
Halting your system without following the shutdown procedure described
in your system software manuals can result in loss of data.
b. Access the DUP driver by setting host to the device you want to
write-protect.
Use the following command for embedded DSSI.
SET HOST/DUP/DSSI/BUS:<bus_number> <node_number> PARAMS
where <bus_number> is the DSSI bus number (0,1,2,3), and <node_
number> is the bus node ID (0–6) for the device on the bus. The bus
number and node number are listed in the SHOW DSSI display.
Use the following command for KFQSA-based DSSI.
SET HOST/DUP/UQSSP/DISK <controller_number> PARAMS
where <controller_number> is the controller number listed in the
SHOW UQSSP display for the device on the bus.
3–6 Operating the System Options
