98 lines
3.4 KiB
Groff
98 lines
3.4 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)swapon.8 8.1 (Berkeley) 6/5/93
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.\" $FreeBSD$
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.\"
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.Dd June 5, 1993
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.Dt SWAPON 8
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.Os BSD 4
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.Sh NAME
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.Nm swapon
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.Nd "specify additional device for paging and swapping"
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.Sh SYNOPSIS
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.Nm
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.Fl a
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.Nm
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.Ar special_file ...
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.Sh DESCRIPTION
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.Nm Swapon
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is used to specify additional devices on which paging and swapping
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are to take place.
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The system begins by swapping and paging on only a single device
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so that only one disk is required at bootstrap time.
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Calls to
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.Nm
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normally occur in the system multi-user initialization file
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.Pa /etc/rc
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making all swap devices available, so that the paging and swapping
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activity is interleaved across several devices.
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.Pp
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Normally, the first form is used:
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.Bl -tag -width indent
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.It Fl a
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All devices marked as ``sw''
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swap devices in
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.Pa /etc/fstab
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are made available unless their ``noauto'' option is also set.
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.El
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.Pp
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The second form gives individual block devices as given
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in the system swap configuration table. The call makes only this space
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available to the system for swap allocation.
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.Sh SEE ALSO
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.Xr swapon 2 ,
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.Xr fstab 5 ,
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.Xr init 8 ,
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.Xr pstat 8 ,
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.Xr rc 8 ,
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.Xr vnconfig 8
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.Sh FILES
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.Bl -tag -width "/dev/{wd,da}?s?b" -compact
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.It Pa /dev/{wd,da}?s?b
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standard paging devices
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.It Pa /dev/vn0b
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vnode disk paging device
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.It Pa /etc/fstab
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ASCII filesystem description table
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.It Pa /etc/vntab
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ASCII vnode file table
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.El
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.Sh BUGS
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There is no way to stop paging and swapping on a device.
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It is therefore not possible to dismount swap devices which are
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mounted during system operation.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.0 .
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