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Date: Fri, 12 Jun 2009 13:57:01 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Zbigniew Szalbot <z.szalbot@lcwords.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: ramdisk creation
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>
> So (1) I need to create an entry in /etc/fstab
> md /var/amavisd/tmp mfs rw,-s512m 2 0

If you have FreeBSD 7.* use tmpfs filesystem

tmpfs /var/amavisd/tmp tmpfs rw,size=536870912 0 0

It's filesystem designed for this. Works well.