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    Command:

    swapoff

    
    
    
    

    SYNOPSIS

           Get info:
                swapon -s [-h] [-V]
    
           Enable/disable:
                swapon [-f] [-p priority] [-v] specialfile...
                swapoff [-v] specialfile...
    
           Enable/disable all:
                swapon -a [-e] [-f] [-v]
                swapoff -a [-v]
    
    
    

    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 boot scripts making all
           swap devices available, so that the paging  and  swapping  activity  is
           interleaved across several devices and files.
    
           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).
    
           -a, --all
                  All devices marked as ''swap'' in /etc/fstab are made available,
                  except for those with the ''noauto'' option.  Devices  that  are
                  already being used as swap are silently skipped.
    
           -d, --discard [=policy]
                  Enable  swap  discards,  if the swap backing device supports the
                  discard or trim operation. This may improve performance on  some
                  Solid  State  Devices,  but often it does not. The option allows
                  one to select  between  two  available  swap  discard  policies:
                  --discard=once  to  perform  a single-time discard operation for
                  the whole swap area at swapon;  or  --discard=pages  to  discard
                  freed  swap pages before they are reused, while swapping.  If no
                  policy is selected, the default behavior is to enable both  dis-
                  card types.  The /etc/fstab mount options discard, discard=once,
                  or discard=pages may be also used to enable discard flags.
    
           -e, --ifexists
                  Silently skip devices that do not exist.
    
           -f, --fixpgsz
                  Reinitialize (exec /sbin/mkswap) the swap space if its page size
                  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, --summary
                  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.
    
           -v, --verbose
                  Be verbose.
    
           -V, --version
                  Display version.
    
    
    

    NOTES

           You  should not use swapon on a file with holes.  Swap over NFS may not
           work.
    
           swapon automatically detects and rewrites swap space signature with old
           software  suspend  data (e.g S1SUSPEND, S2SUSPEND, ...). The problem is
           that if we don't do it, then we get data corruption the  next  time  an
           attempt at unsuspending is made.
    
    
    

    SEE ALSO

           swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)
    
    
    

    FILES

           /dev/sd??  standard 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 avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
    
    

    Linux 1.x 25 September 1995 SWAPON(8)

    
    
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