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    Command:

    swapon

    
    
    
    

    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.
    
           -e, --ifexists
                  Silently skip devices that do not exist.
    
           -f, --fixpgsz
                  Reinitialize (exec /sbin/mkswap) the swap space if its page size
                  does  not  match  that  of  the  the  current  running   kernel.
                  mkswap(2)  initializes  the  whole device and does not check for
                  bad blocks.
    
           -h, --help
                  Provide help.
    
           -L label
                  Use the partition that has  the  specified  label.   (For  this,
                  access to /proc/partitions is needed.)
    
           -p, --priority priority
                  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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