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Section: Linux Programmer's Manual (8)
Updated: 25 September 1995
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NAMEswapon, 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/swapoff [-h -V]
/sbin/swapoff specialfile ...
DESCRIPTIONSwapon 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:
- Provide help
- Display version
- Display swap usage summary by device. This option is only available if /proc/swaps exists (probably not before kernel 2.1.25).
- All devices marked as ``sw'' swap devices in /etc/fstab are made available. Devices that are already running as swap are silently skipped.
- 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.
NOTEYou should not use swapon on a file with holes. Swap over NFS may not work.
SEE ALSOswapon(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
HISTORYThe swapon command appeared in 4.0BSD.
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