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@(#)swapon.8 8.1 (Berkeley) 6/5/93
$FreeBSD: head/sbin/swapon/swapon.8 107913 2002-12-15 19:17:57Z dillon $
.Dd June 5, 1993 .Dt SWAPON 8 .Os .Sh NAME .Nm swapon , swapoff .Nd "specify devices for paging and swapping" .Sh SYNOPSIS .Nm swap[on|off] .Fl a .Nm swap[on|off] .Ar special_file ... .Sh DESCRIPTION The .Nm swapon utility 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 .Nm swapon normally occur in the system multi-user initialization file
a /etc/rc making all swap devices available, so that the paging and swapping activity is interleaved across several devices.
p The .Nm swapoff utility disables paging and swapping on a device. Calls to .Nm swapoff succeed only if disabling the device would leave enough remaining virtual memory to accomodate all running programs.
p Normally, the first form is used: l -tag -width indent t Fl a All devices marked as ``sw'' swap devices in
a /etc/fstab are added to or removed from the pool of available swap unless their ``noauto'' option is also set. .El
p The second form is used to configure or disable individual devices. .Sh SEE ALSO .Xr swapon 2 , .Xr fstab 5 , .Xr init 8 , .Xr mdconfig 8 , .Xr pstat 8 , .Xr rc 8 .Sh FILES l -tag -width "/dev/{ad,da}?s?b" -compact t Pa /dev/{ad,da}?s?b standard paging devices t Pa /dev/md? memory disk devices t Pa /etc/fstab ASCII file system description table .El .Sh HISTORY The .Nm swapon utility appeared in x 4.0 . The .Nm swapoff utility appeared in .Fx 5.0 .