From owner-freebsd-current@FreeBSD.ORG Fri Sep 28 23:23:00 2012 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id CFD3A106566C; Fri, 28 Sep 2012 23:23:00 +0000 (UTC) (envelope-from zeising@daemonic.se) Received: from mail.lysator.liu.se (mail.lysator.liu.se [IPv6:2001:6b0:17:f0a0::3]) by mx1.freebsd.org (Postfix) with ESMTP id 47C728FC0A; Fri, 28 Sep 2012 23:23:00 +0000 (UTC) Received: from mail.lysator.liu.se (localhost [127.0.0.1]) by mail.lysator.liu.se (Postfix) with ESMTP id F15FF40009; Sat, 29 Sep 2012 01:22:58 +0200 (CEST) Received: by mail.lysator.liu.se (Postfix, from userid 1004) id E2CEB4000C; Sat, 29 Sep 2012 01:22:58 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on bernadotte.lysator.liu.se X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=AWL autolearn=disabled version=3.3.1 X-Spam-Score: 0.0 Received: from mx.daemonic.se (mx.daemonic.se [IPv6:2001:470:dca9:0:1::3]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.lysator.liu.se (Postfix) with ESMTPSA id 347A340009; Sat, 29 Sep 2012 01:22:57 +0200 (CEST) Received: from mailscanner.daemonic.se (mailscanner.daemonic.se [IPv6:2001:470:dca9:0:1::6]) by mx.daemonic.se (Postfix) with ESMTPS id 3XT87h5hBkz8ggx; Sat, 29 Sep 2012 01:22:56 +0200 (CEST) X-Virus-Scanned: amavisd-new at daemonic.se Received: from mx.daemonic.se ([IPv6:2001:470:dca9:0:1::3]) (using TLS with cipher CAMELLIA256-SHA) by mailscanner.daemonic.se (mailscanner.daemonic.se [IPv6:2001:470:dca9:0:1::6]) (amavisd-new, port 10025) with ESMTPS id tszyfbxBNpsY; Sat, 29 Sep 2012 01:22:54 +0200 (CEST) Received: from mail.daemonic.se (mail.daemonic.se [10.1.0.4]) by mx.daemonic.se (Postfix) with ESMTPS id 3XT87f4tKyz8ggv; Sat, 29 Sep 2012 01:22:54 +0200 (CEST) Received: from [IPv6:2001:470:dca9:1::4] (vivi.daemonic.se [IPv6:2001:470:dca9:1::4]) by mail.daemonic.se (Postfix) with ESMTPSA id 3XT87f3Txtz9Ctq; Sat, 29 Sep 2012 01:22:54 +0200 (CEST) Message-ID: <5066314A.4010309@daemonic.se> Date: Sat, 29 Sep 2012 01:22:50 +0200 From: Niclas Zeising User-Agent: Mutt/1.5.21 MIME-Version: 1.0 To: "Matthew D. Fuller" References: <20120928163304.GC1287@glenbarber.us> <20120928193758.GC71113@over-yonder.net> <20120928194923.GD71113@over-yonder.net> In-Reply-To: <20120928194923.GD71113@over-yonder.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV using ClamSMTP X-Mailman-Approved-At: Sat, 29 Sep 2012 02:32:45 +0000 Cc: freebsd-fs@freebsd.org, Glen Barber , freebsd-current@freebsd.org, Sami Halabi Subject: Re: ZFS on HEAD X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Sep 2012 23:23:00 -0000 On 2012-09-28 21:49, Matthew D. Fuller wrote: > On Fri, Sep 28, 2012 at 09:44:08PM +0200 I heard the voice of > Sami Halabi, and lo! it spake thus: >> >> what count for little, and what count for huge. > > Off the top of my head, I'd say less than 1 gig (maybe 2) or more than > 256. With very little, you may need to start looking at some of the > i386 tuning to things to scale back. But anywhere in the middle the > defaults should work fine (I'm sure there are gains to be had from > working at tuning, but probably not huge and probably very dependent > on your particular hardware and workloads). > > Just as a measuring point, I managed to run ZFS on an moderately busy FTP server with 2GB while waiting for replacement RAM. It worked, but is perhaps not the best approach. Less than 4 or even 8GB ram is probably not recommended these days, especially since RAM is resonably cheap. Regards! -- Niclas P.S. The handbook should perhaps be slightly updated wrt ZFS, at least to clarify that tuning is only needed on i386 in the general case, and that you're usually better off running ZFS on an amd64 machine if you can choose. I'll look into it tomorrow...