From owner-freebsd-stable@FreeBSD.ORG Fri May 1 23:12:50 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1E35C1065674 for ; Fri, 1 May 2009 23:12:50 +0000 (UTC) (envelope-from louisk@cryptomonkeys.org) Received: from nes.txt.com (nes.txt.com [192.160.132.20]) by mx1.freebsd.org (Postfix) with ESMTP id EF1CF8FC20 for ; Fri, 1 May 2009 23:12:49 +0000 (UTC) (envelope-from louisk@cryptomonkeys.org) Received: from localhost (localhost [127.0.0.1]) by nes.txt.com (Postfix) with ESMTP id 5808E3DD; Fri, 1 May 2009 16:11:49 -0700 (PDT) Received: from nes.txt.com ([127.0.0.1]) by localhost (nes.txt.com [127.0.0.1]) (amavisd-maia, port 10024) with ESMTP id 58479-09; Fri, 1 May 2009 16:11:49 -0700 (PDT) Received: from lk-mbp.local (unknown [64.1.215.241]) (Authenticated sender: louisk@cryptomonkeys.org) by nes.txt.com (Postfix) with ESMTPSA id CE21D3DC; Fri, 1 May 2009 16:11:48 -0700 (PDT) Received: from practivate.adobe.com by lk-mbp.local (PGP Universal service); Fri, 01 May 2009 16:12:48 -0700 X-PGP-Universal: processed; by lk-mbp.local on Fri, 01 May 2009 16:12:48 -0700 Message-Id: <32A0BDD9-ACF8-43F4-8D2C-0FC151F1D7CB@cryptomonkeys.org> From: Louis Kowolowski To: Pete French In-Reply-To: Mime-Version: 1.0 (Apple Message framework v930.3) Date: Fri, 1 May 2009 16:12:39 -0700 References: X-Mailer: Apple Mail (2.930.3) Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: current zfs tuning in RELENG_7 (AMD64) suggestions ? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 May 2009 23:12:50 -0000 On May 1, 2009, at 1:53 PM, Pete French wrote: > ... > The tuning isn't there to improve performance, it's there to prevent > the box going titus due to a panic when the ARC gets too big, and > you are missing the mian one, which is to limit the size of the ARC. > On recent versions of BSD (and you are running 7.2, so thats fine) > then > the defaults for kmem size are fine, but you still need something > like this: > > vfs.zfs.arc_max="256M" > > In there to stop the ARC growing. thats the only tuning I have on > my 4 gig machine, which takes a steady stream of data and is used > for taking backup snapshots. ZFS is excellent, and for me is perfectly > stable, to the point where I am starting to roll it out to production > machines, with the above tuning. > I agree, although I'm using 384 instead of 256. My systems have been running in production for almost a year now w/o any ZFS issues. -- Louis Kowolowski louisk@cryptomonkeys.org Cryptomonkeys: http://www.cryptomonkeys.org/~louisk Making life more interesting for people since 1977