From owner-freebsd-questions@FreeBSD.ORG Tue Jul 29 16:08:01 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 77F4BE4D for ; Tue, 29 Jul 2014 16:08:01 +0000 (UTC) Received: from mail-qg0-f54.google.com (mail-qg0-f54.google.com [209.85.192.54]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 2B2A72201 for ; Tue, 29 Jul 2014 16:08:00 +0000 (UTC) Received: by mail-qg0-f54.google.com with SMTP id z60so10667115qgd.41 for ; Tue, 29 Jul 2014 09:07:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:content-type:mime-version:subject:from :in-reply-to:date:content-transfer-encoding:message-id:references:to; bh=Mdd9jkwIvoBcPgzHBnpgUOOmKkhcVv7OS6DT1Y4gkwk=; b=PIYjP1Q+YeLHn1iFsDnCgrxDzjnam3Z+DRKOlAoO+f9ULpQJ0WRHI9VnnZdt/Y3dtv B3KRfkbchdb5/HBLH2ZC+8Etpkipb+dHLvtHV5kbz79ocem08h+htpM7wFDvrE1sa4oN 9QlFv130Pe3xBTy1GMoc2iHWoAqyR+r3nEyw3XIZZ+UVaSmxaLmIskA+1nNOs2/rYJ3A ryoInvZOtoN8zdsBtJb6/qUkxV+W5UNCMqwN8JMTFtYVAAaI44QOl7EvP4JgcDvghbtG ukygBGlCVhEQPoo13gbily730BUg436eRh+sWhvALAjT+3QWIbNaWljox5vj9HiR4n2K qctQ== X-Gm-Message-State: ALoCoQmg50PKgX9AwTqtbifWJ5Ypt2QsX6yNj7zRCblU5h5EcHmnTP2n49TPqZ8raRvMZ3aH7PLL X-Received: by 10.140.101.86 with SMTP id t80mr4514616qge.91.1406650074555; Tue, 29 Jul 2014 09:07:54 -0700 (PDT) Received: from [192.168.2.65] ([96.236.21.80]) by mx.google.com with ESMTPSA id a6sm20747693qaa.32.2014.07.29.09.07.53 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 29 Jul 2014 09:07:54 -0700 (PDT) Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Subject: Re: deciding UFS vs ZFS From: Paul Kraus In-Reply-To: Date: Tue, 29 Jul 2014 12:07:53 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: <055DBC99-E2BB-4B45-96EB-2D79C067F7EF@kraus-haus.org> References: <20140713190308.GA9678@bewilderbeast.blackhelicopters.org> <20140714071443.42f615c5@X220.alogt.com> <53C326EE.1030405@my.hennepintech.edu> <20140714111221.5d4aaea9@X220.alogt.com> <20140715143821.23638db5@gumby.homeunix.com> <20140716143929.74209529@gumby.homeunix.com> <20140718180416.715cdc0b@gumby.homeunix.com> <20140722133305.228a1690@gumby.homeunix.com> <8699AF5D2BE8E9EBCFFEEE17@192.168.1.50> <20140722222722.70f13ec9@gumby.homeunix.com> <20140724002912.5eda1757@gumby.homeunix.com> <98DFE7A36ED2EBA26E6C710C@192.168.1.50> To: "freebsd-questions@freebsd.org" X-Mailer: Apple Mail (2.1878.6) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Jul 2014 16:08:01 -0000 >> Assuming you mean ProLiant 712317-001 Ultra Micro Tower Server, those = cost >> around $400 with 2GB of RAM. 1GB/TB of RAM to storage, it will need = more >> RAM according to: >> "A general rule of thumb is 1GB of RAM for every 1TB of storage.=94 >> https://www.freebsd.org/doc/handbook/filesystems-zfs.html That is an overly generic recommendation. For the ZFS ARC to be of any = real use you really need a minimum of 2GB RAM. The 1GB per 1TB = recommendation is a bastardization of the recommendation from the = ZFS-List. If you enable Dedupe it should really be a REQUIREMENT to have = 1GB FRRE RAM for each 1TB of NET storage. Having said that, the more RAM you can throw at ZFS (and the ARC) the = better off you will be for any configuration. It all depends on your = workload. -- Paul Kraus paul@kraus-haus.org