swapon - 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  avail-
              able, 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).

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.



Linux 1.x                      25 September 1995                     SWAPON(8)

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