User`s guide
3.1
INTRODUCTION
CHAPTER 3
COLD AND WARM START FUNCTIONS
Whether the V
AX-II
/730
console subsystem performs either a cold start
of
the operating system or
diagnostic supervisor,
or' a warm start
of
the operating system
is
determined by the following conditions:
• The setting
of
the front panel
AUTO/RESTART
switch during a power-up sequence, power
restoration, or a system
HALT
• The command typed
at
the console terminal while the
CPU
is
in
the console
I/O
mode wait
loop
• The failure
of
a warm start
• The setting
of
the
AUTO/RESTART
switch while the
CPU
is
in
the console
I/O
mode wait
loop
At
most, the V
AX-II
/730
attempts one cold start
of
the operating system and the diagnostic supervisor
and one warm start
of
the operating system,
3.2 COLD START (BOOT)
Cold start or boot refers to loading either the operating system or diagnostic supervisor and starting it.
Cold start for the V
AX-II
/730
operating system
is
initiated by one
of
the actions listed below:
• A power-up sequence with the
AUTO/RESTART
switch set to
ON
• Typing the BOOT command while the
CPU
is
in
the console
I/O
mode wait loop
• Setting the
AUTO/REST
AR
T switch to the momentary contact position
of
BOOT
• Setting the
AUTO/RESTART
switch to the
ON
position and executing a
HALT
instruction
while the
CPU
is
in the kernel mode
• Failure
of
a warm
start
while the
AUTO/RESTART
switch
is
set to the
ON
position
Cold start for the diagnostic supervisor
is
initiated by typing the BOOT supervisor command while the
system
is
in
the console
I/O
mode (Chapter
5).
3.2.1 Console Subsystem Action
on
a Cold
Start
When cold starting either the operating system or the diagnostic supervisor, the console subsystem initiates
the sequence of events shown
in
Figure 3-1.
3-1