swapoff(8) -- Linux man page
NAME
swapon, swapoff - enable/disable devices and files for paging and swapping
SYNOPSIS
/sbin/swapon [-h -V]
/sbin/swapon -a [-v] [-e]
/sbin/swapon [-v] [-p priority] specialfile ...
/sbin/swapon [-s]
/sbin/swapoff [-h -V]
/sbin/swapoff -a
/sbin/swapoff specialfile ...
DESCRIPTION
Swapon
is used to specify devices on which paging and swapping are to take place.
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:
- -h
-
Provide help
- -V
-
Display version
- -s
-
Display swap usage summary by device. Equivalent to "cat /proc/swaps".
Not available before Linux 2.1.25.
- -a
-
All devices marked as ``swap'' swap devices in
/etc/fstab
are made available. 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.
- -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. 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.
specialfile
means file, device, LABEL=label_name or UUID=uuid.
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.
SEE ALSO
swapon(2),
swapoff(2),
fstab(5),
init(8),
mkswap(8),
rc(8),
mount(8)
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.
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