SWAP(1M)                        Domain/OS SysV                        SWAP(1M)




NAME
     swapon - specify additional device for paging and swapping

SYNOPSIS
     /etc/swapon -a
     /etc/swapon name ...

DESCRIPTION
     swapon is used to specify additional devices on which paging and swapping
     are to take place.  The system begins by swapping and paging on only a
     single device so that only one disk is required at bootstrap time.  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.

     Normally, the -a argument is given, causing all devices marked as ``sw''
     swap devices in /etc/fstab to be made available.

     The second form gives individual block devices as given in the system
     swap configuration table.  The call makes only this space available to
     the system for swap allocation.

SEE ALSO
     swapon(2), init(1m)

FILES
     /dev/[ru][pk]?b     normal paging devices

NOTES
     Some disk devices, such as the 20GB/A Optical Disk Library System, have
     performance characteristics that are unacceptable for swap media.  On
     such devices, swapon fails with the error message "Device is not
     configured".

BUGS
     There is no way to stop paging and swapping on a device.  It is therefore
     not possible to make use of devices which may be dismounted during system
     operation.