User`s guide
3.3
WARM
START (REST ART)
Warm
start
or restart refers to restarting the operating system without reloading it into memory. When the
console subsystem gains control
of
the
VAX-ll/730
following a
CPU
halt or power restoration, it
performs the sequence of events shown in Figure 3-2.
The sequence
of
events performed by the console subsystem for warm starting the operating system
is
outlined
in
the following list.
The console subsystem:
1.
Examines the
AUTO/RESTART
switch to determine what action
will
be taken.
If
the switch
is
in the
OFF
position, the
CPU
enters the console
I/O
mode wait loop.
If
the switch
is
set to the
ON
position the console subsystem prints the console terminal message
RESTART
IN
PROGRESS.
2.
Examines main memory to determine if data has been preserved.
If
no
data
is
preserved the
warm start fails.
PRINT
"ATTEMPTING SYSTEM
RESTART"
LOAD
AP
WITH
HALT
CODE
START EXECUTION
OF
WARM START
ROUTINE
"$"
PRINT
"SYSTEM RESTART
FAILED"
ATTEMPT
BOOT
TK-9706
Figure 3-2
Warm
Start
of
the Operating System
3-7