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Date: Thu, 07 Feb 2008 08:26:07 +0100
From: Dominic Fandrey <kamikaze@bsdforen.de>
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To: "Heiko Wundram (Beenic)" <wundram@beenic.net>
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Cc: "Jason C. Wells" <jcw@highperformance.net>, freebsd-questions@freebsd.org
Subject: Re: Some ideas for FreeBSD
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Heiko Wundram (Beenic) wrote:
> Am Donnerstag, 7. Februar 2008 07:32:16 schrieb Jason C. Wells:
>> Norberto Meijome wrote:
>>> But I agree with Wojciech..do you really want to use swap files?
>> One could mount an md filesystem and then use that as swap.  That way
>> you wouldn't need to use any disc space.  As a plus, the performance
>> would be way better than disc.
> 
> Ahem, sorry, that's just plain stupid. Either the md system is backed up by 
> RAM (in which case you don't need the swap anyway; why'd you want to access 
> RAM by putting it in a swap on an md in RAM?), or it's backed up by swap, in 
> which case you have a chicken and egg problem.
> 

Or it's backed by a file (-t vnode, which is implicated by -f). I have used 
files for swap, just to see weather it works, others have done it because they 
had to.