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1.1 root 1: .TH REBOOT 8
2: .CT 1 sa_auto
3: .SH NAME
4: reboot \- bootstrapping procedures
5: .SH DESCRIPTION
6: .PP
7: Here are some recipes for booting and crashing the operating system
8: on VAXes.
9: .SS Rebooting a running system
10: The preferred way to reboot is to log in on the console as super-user,
11: invoke
12: .B kill 1
13: to take the system to single user,
14: unmount file systems with
15: .B /etc/umount -a
16: and halt and restart the system
17: as described below under `Console boots.'
18: .SS Power fail and crash recovery
19: The system will reboot itself at power-up or after crashes if
20: auto-boot is enabled on the machine front panel
21: or in the console software.
22: If auto-restart is enabled,
23: the system will first attempt to save a copy of physical memory
24: on a reserved piece of disk.
25: An automatic consistency check of the file systems is performed.
26: Unless this fails the system will resume multi-user operations.
27: .SS Console boots
28: Sync the disks if necessary and possible.
29: To recover hardware control of the console, type a
30: .RB control- P .
31: This will yield a
32: .L >>>
33: prompt from the VAX
34: console subsystem (sic).
35: The command
36: .IP
37: .B >>> H
38: .LP
39: will halt the CPU
40: (except on the 11/750,
41: where
42: .RB control- P
43: halts the CPU right away).
44: .PP
45: On MicroVAXes,
46: .RB control- P
47: doesn't work;
48: hit the
49: .SM BREAK
50: key instead.
51: .PP
52: To boot multi-user with an automatic file system check,
53: give the console command
54: .IP
55: .B >>> B
56: .LP
57: Commands to boot single-user vary.
58: On the VAX-11/750 and on MicroVAXes,
59: use
60: .IP
61: .B >>> B/3
62: .LP
63: On the VAX-11/780 and VAX 8550 and 8700,
64: use
65: .IP
66: .B >>> B MAN
67: .LP
68: This will prompt with
69: .LR *
70: for the name of the file to boot.
71: The filename should be an executable image
72: in the root directory
73: of the filesystem at the beginning of the disk.
74: .SS System core images
75: If the system crashes
76: and auto-restart is enabled,
77: a copy of physical memory is written
78: to a reserved piece of disk.
79: To save a core image of a hung system, type on the console (after
80: .RB control- P
81: if necessary):
82: .IP
83: .EX
84: >>> S 80000010
85: .EE
86: .PP
87: The system will write the core image,
88: then reboot automatically.
89: .PP
90: If the core image was written on
91: .LR /dev/ra11 ,
92: the following incantation will print a stack traceback
93: from the time of the crash:
94: .IP
95: .EX
96: adb /unix /dev/ra11
97: $<crash
98: $c
99: .EE
100: .PP
101: To save disk space,
102: the core image is sometimes overlaid on part of the swap area,
103: where normal system operation will soon overwrite it.
104: .IR Savecore (8)
105: will copy the core image
106: to an ordinary disk file.
107: .SH FILES
108: .TP
109: .F /unix
110: default system binary
111: .SH "SEE ALSO"
112: .IR fsck (8),
113: .IR init (8),
114: .IR rc (8),
115: .IR savecore (8)
116: .SH BUGS
117: Older boot programs with different syntax are still around in a few places,
118: especially on machines with Emulex UNIBUS disk controllers,
119: for which silly boot ROMs are common.
120: .PP
121: There are commands
122: .B /etc/reboot
123: and
124: .B /etc/halt
125: which attempt to reboot and halt the system;
126: their function is indeterminate
127: and likely to change.
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