xref: /freebsd/sbin/swapon/swapon.8 (revision 380a989b3223d455375b4fae70fd0b9bdd43bafb)
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32.\"     @(#)swapon.8	8.1 (Berkeley) 6/5/93
33.\"	$Id: swapon.8,v 1.9 1998/02/01 06:46:37 steve Exp $
34.\"
35.Dd June 5, 1993
36.Dt SWAPON 8
37.Os BSD 4
38.Sh NAME
39.Nm swapon
40.Nd "specify additional device for paging and swapping"
41.Sh SYNOPSIS
42.Nm swapon
43.Fl a
44.Nm swapon
45.Ar special_file ...
46.Sh DESCRIPTION
47.Nm Swapon
48is used to specify additional devices on which paging and swapping
49are to take place.
50The system begins by swapping and paging on only a single device
51so that only one disk is required at bootstrap time.
52Calls to
53.Nm
54normally occur in the system multi-user initialization file
55.Pa /etc/rc
56making all swap devices available, so that the paging and swapping
57activity is interleaved across several devices.
58.Pp
59Normally, the first form is used:
60.Bl -tag -width indent
61.It Fl a
62All devices marked as ``sw''
63swap devices in
64.Pa /etc/fstab
65are made available unless their ``noauto'' option is also set.
66.El
67.Pp
68The second form gives individual block devices as given
69in the system swap configuration table.  The call makes only this space
70available to the system for swap allocation.
71.Sh SEE ALSO
72.Xr swapon 2 ,
73.Xr fstab 5 ,
74.Xr init 8 ,
75.Xr pstat 8 ,
76.Xr rc 8 ,
77.Xr vnconfig 8
78.Sh FILES
79.Bl -tag -width /dev/[ru][pk]?b -compact
80.It Pa /dev/[ru][pk]?b
81standard paging devices
82.It Pa /etc/fstab
83ascii filesystem description table
84.El
85.Sh BUGS
86There is no way to stop paging and swapping on a device.
87It is therefore not possible to make use of devices which may be
88dismounted during system operation.
89.Sh HISTORY
90The
91.Nm
92command appeared in
93.Bx 4.0 .
94