swapon, swapoff — enable/disable devices and files for paging and swapping
/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...
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
).
/dev/hd??
standard paging
devices
/dev/sd??
standard (SCSI)
paging devices
/etc/fstab
ascii filesystem
description table
The swapon command appeared in 4.0BSD.
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