From owner-freebsd-fs@FreeBSD.ORG Wed Mar 2 10:29:13 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C33091065674 for ; Wed, 2 Mar 2011 10:29:13 +0000 (UTC) (envelope-from joe@tao.org.uk) Received: from alpha.tao.org.uk (alpha.tao.org.uk [212.42.1.232]) by mx1.freebsd.org (Postfix) with ESMTP id 85D848FC18 for ; Wed, 2 Mar 2011 10:29:13 +0000 (UTC) Received: from localhost (alpha.tao.org.uk [212.42.1.232]) by alpha.tao.org.uk (Postfix) with ESMTP id 150351076C80; Wed, 2 Mar 2011 10:29:12 +0000 (GMT) Received: from alpha.tao.org.uk ([212.42.1.232]) by localhost (mail.tao.org.uk [212.42.1.232]) (amavisd-maia, port 10024) with LMTP id 35370-06; Wed, 2 Mar 2011 10:29:01 +0000 (GMT) Received: from [90.155.77.76] (unknown [90.155.77.76]) (Authenticated sender: joemail@alpha.tao.org.uk) by alpha.tao.org.uk (Postfix) with ESMTPA id 4B3A41076CA5; Wed, 2 Mar 2011 10:28:53 +0000 (GMT) Mime-Version: 1.0 (Apple Message framework v1081) Content-Type: text/plain; charset=us-ascii From: Dr Josef Karthauser In-Reply-To: <20110302001650.GB49147@icarus.home.lan> Date: Wed, 2 Mar 2011 10:28:50 +0000 Content-Transfer-Encoding: quoted-printable Message-Id: <27423168-85BE-41B1-8E14-94F01310EFE4@tao.org.uk> References: <0E00DAFC-C39F-47DC-B9AF-16419C20997F@tao.org.uk> <615F1346-E830-42E2-B229-4181B8BC56BD@exonetric.com> <53FA69D2-2EF0-4CBF-985B-6E710F15FE02@tao.org.uk> <20110302001650.GB49147@icarus.home.lan> To: Jeremy Chadwick X-Mailer: Apple Mail (2.1081) X-Virus-Scanned: Maia Mailguard 1.0.2a Cc: freebsd-fs@freebsd.org Subject: Re: ZFS on a single disk? X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Mar 2011 10:29:13 -0000 On 2 Mar 2011, at 00:16, Jeremy Chadwick wrote: > Do not disable the ZIL. I hate referring to the Solaris documentation > for FreeBSD, but it applies: >=20 > = http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disab= ling_the_ZIL_.28Don.27t.29 >=20 > And you cannot disable the ARC, so just tune it appropriately (which > you'll need to do on FreeBSD anyway). In fact, by getting rid of the > ARC (as you proposed), you would suffer worse performance than if you > had it in use. I guess I should have been a bit clearer, I mean without any external = devices backing them. Seeing as this is to be running on a VPS/Xen at a = hosting environment I'm not able to add any additional devices. I'm not = memory starved however. Is it madness to use a memory disk? (The = instance in question will have 6gb of ram total to play with.). Joe