swapon(8) - phpMan

SWAPON(8)                           Linux Programmer's Manual                           SWAPON(8)



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.

       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/parti-
              tions 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  descrip-
              tion  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  avail-
              able before Linux 2.1.25.

       -U uuid
              Use  the  partition that has the specified uuid.  (For this, access to /proc/parti-
              tions 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.

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.

AVAILABILITY
       The  swapon  command  is  part  of  the  util-linux-ng  package  and  is  available   from
       ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.



Linux 1.x                               25 September 1995                               SWAPON(8)

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