From owner-freebsd-questions@FreeBSD.ORG  Sun Jun 15 06:34:13 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 60DC01065675
	for <questions@freebsd.org>; Sun, 15 Jun 2008 06:34:13 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl
	[IPv6:2001:4070:101:2::1])
	by mx1.freebsd.org (Postfix) with ESMTP id 6E26D8FC16
	for <questions@freebsd.org>; Sun, 15 Jun 2008 06:34:11 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (localhost [IPv6:::1])
	by wojtek.tensor.gdynia.pl (8.14.2/8.14.2) with ESMTP id m5F6WZfs020567;
	Sun, 15 Jun 2008 08:32:35 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
	by wojtek.tensor.gdynia.pl (8.14.2/8.14.2/Submit) with ESMTP id
	m5F6WYLX020564; Sun, 15 Jun 2008 08:32:34 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Sun, 15 Jun 2008 08:32:34 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: RW <fbsd06@mlists.homeunix.com>
In-Reply-To: <20080614224742.17316919@gumby.homeunix.com.>
Message-ID: <20080615083039.M19706@wojtek.tensor.gdynia.pl>
References: <20080614224742.17316919@gumby.homeunix.com.>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: questions@freebsd.org
Subject: Re: md devices mounted with async
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 15 Jun 2008 06:34:13 -0000

>
> mdmfs(8) has an example of a malloc-backed md device mounted with the
> async option. Is there any point in doing this with malloc and vnode
> devices? In neither case does a write to the file-system require a write
> to a physical disk.
i don't think so.

but if you use FreeBSD 7 use tmpfs. it says it's experimental feature, but 
still not crashed on 3 computers i use it.

what it's missing is some kind of quota, you may crash the system by 
simply filling it up and using all swap