From owner-freebsd-isp  Fri Aug 22 00:54:26 1997
Return-Path: <owner-freebsd-isp>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id AAA23803
          for isp-outgoing; Fri, 22 Aug 1997 00:54:26 -0700 (PDT)
Received: from balder.besys.net.au (root@[203.103.239.193])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id AAA23796
          for <freebsd-isp@FreeBSD.ORG>; Fri, 22 Aug 1997 00:54:04 -0700 (PDT)
Received: from ingold.besys.net.au (ingold.besys.net.au [203.103.239.196])
	by balder.besys.net.au (8.8.6/8.8.5) with ESMTP id RAA03015
	for <freebsd-isp@FreeBSD.ORG>; Fri, 22 Aug 1997 17:53:39 +1000 (EST)
Message-ID: <33FD4581.456FE788@besys.net.au>
Date: Fri, 22 Aug 1997 17:53:37 +1000
From: Peter Champas <peter@besys.net.au>
Organization: http://www.besys.net.au/
X-Mailer: Mozilla 4.01 [en] (Win95; I)
MIME-Version: 1.0
To: freebsd-isp@FreeBSD.ORG
Subject: Re: Multiple Swap Partitions
X-Priority: 3 (Normal)
References: <Pine.BSF.3.96.970821115519.14150A-100000@sunasci.informador.com.mx>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-isp@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

Felipe Rivera Marquez wrote:
> 
>         Taken from man pages of swapon
> ------------------------------------
> 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
> swap-
>      ping activity is interleaved across several devices.
> ------------------------------------------------------------
> 
>         So, in theory, you can have several swap partitions defined in
> /etc/fstab.
> 
>         The thing i've tried is using vn devices to allow swaping on a
> file, and maybe this is more useful for you.
> 
>         0. Recompile your kernel if it has no support for vn
> pseudo-devices. Add this line to your kernel configuration
> 
>          pseudo-device  vn   4
> 
>         1. Create a file as big as you want the aditional swap space
> to
>         be. (I put it on /var/tmp)
> 
>         2. Create vn devices
> 
>         /dev/MAKEDEV vn0
> 
>         3. Use vnconfig to configure the special file and activate
> swap on
>         it.
> 
>         vnconfig -e /dev/vn0 /var/tmp/swapfile swap)

And most inportant don't foget to do a 
/sbin/swapon /dev/vn0

Everyone Seems to forget to tell you these LITTLE things :))
But this method does work real well 

cheers
-- 
*---------------------[ http://www.besys.net.au/ ]---------------------*
| Peter Champas                      |          peter@besys.net.au     |
|----------------------------------------------------------------------|
| I don't demand perfection, just something that's reasonably reliable |
*----------------------------------------------------------------------*