Name
swapon, swapoff — enable/disable devices and files
for paging and swapping
Synopsis
/sbin/swapon −a [−v] [−e]
/sbin/swapon [−v] [ −p priority ] specialfile...
/sbin/swapoff
specialfile...
DESCRIPTION
Swapon is used
to specify devices on which paging and swapping are to take
place.
The device or file used is given by the specialfile parameter. It may
be of the form −L
label or −U uuid to indicate a device by label
or uuid.
Calls to swapon normally occur in the system
multi-user initialization file /etc/rc making all swap devices available,
so that the paging and swapping activity is interleaved
across several devices and files.
Normally, the first form is used:
−a-
All devices marked as ``swap'' swap devices in
/etc/fstab are made
available, except for those with the ``noauto'' option.
Devices that are already running as swap are silently
skipped.
−e-
When −a is used
with swapon, −e makes
swapon silently skip devices that do not exist.
−h-
Provide help
−L
label-
Use the partition that has the specified label. (For this,
access to /proc/partitions is needed.)
−p
priority-
Specify priority for swapon. This option is only
available if swapon was compiled under and
is used under a 1.3.2 or later kernel. priority is a value
between 0 and 32767. Higher numbers indicate higher
priority. See swapon(2) for a full
description of swap priorities. Add pri=value to the option
field of /etc/fstab for
use with swapon
-a.
−s-
Display swap usage summary by device. Equivalent to
"cat /proc/swaps". Not available before Linux
2.1.25.
−U
uuid-
Use the partition that has the specified uuid. (For this, access
to /proc/partitions is
needed.)
−v-
Be verbose.
−V-
Display version
Swapoff disables
swapping on the specified devices and files. When the
−a flag is given, swapping
is disabled on all known swap devices and files (as found in
/proc/swaps or /etc/fstab).
NOTE
You should not use swapon on a file with holes. Swap
over NFS may not work.
FILES
/dev/hd?? standard paging
devices
/dev/sd?? standard (SCSI)
paging devices
/etc/fstab ascii filesystem
description table
HISTORY
The swapon
command appeared in 4.0BSD.
Copyright (c) 1980, 1991 Regents of the University of California.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)swapon.8
6.3 (Berkeley) 3/16/91
Sun Dec 27 12:31:30 1992: Modified by faith@cs.unc.edu
Sat Mar 6 20:46:02 1993: Modified by faith@cs.unc.edu
Sat Oct 9 09:35:30 1993: Converted to man format by faith@cs.unc.edu
Sat Nov 27 20:22:42 1993: Updated authorship information, faith@cs.unc.edu
Mon Sep 25 14:12:38 1995: Added -v and -p information
Tue Apr 30 03:32:07 1996: Added some text from A. Koppenhoefer
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