GNU/Linux man pages
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GNU/Linux |
CentOS 4.8 |
i386 |
 |
swapoff(8) |
 |
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. 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:
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−h |
Provide help | ||
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−V |
Display version | ||
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−s |
Display swap usage summary by device. Equivalent to "cat /proc/swaps". Not available before Linux 2.1.25. | ||
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−a |
All devices marked as ’’swap’’ swap devices in /etc/fstab are made available. Devices that are already running as swap are silently skipped. | ||
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−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).
You should not use swapon on a file with holes. Swap over NFS may not work.
swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)
/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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swapoff(8) | |