From owner-freebsd-questions@FreeBSD.ORG Sat Feb 18 13:39:19 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2D45F106566B for ; Sat, 18 Feb 2012 13:39:19 +0000 (UTC) (envelope-from m.seaman@infracaninophile.co.uk) Received: from smtp.infracaninophile.co.uk (smtp6.infracaninophile.co.uk [IPv6:2001:8b0:151:1:3cd3:cd67:fafa:3d78]) by mx1.freebsd.org (Postfix) with ESMTP id 97B4B8FC08 for ; Sat, 18 Feb 2012 13:39:18 +0000 (UTC) Received: from seedling.black-earth.co.uk (seedling.black-earth.co.uk [IPv6:2001:8b0:151:1:fa1e:dfff:feda:c0bb]) (authenticated bits=0) by smtp.infracaninophile.co.uk (8.14.5/8.14.5) with ESMTP id q1IDdFgc046073 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO) for ; Sat, 18 Feb 2012 13:39:15 GMT (envelope-from m.seaman@infracaninophile.co.uk) X-DKIM: OpenDKIM Filter v2.4.3 smtp.infracaninophile.co.uk q1IDdFgc046073 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=infracaninophile.co.uk; s=201001-infracaninophile; t=1329572355; bh=Q36n30qO/j+hcuWa4q9u8oLVbZkSgpS7n97onP2/OOg=; h=Message-ID:Date:From:MIME-Version:To:Subject:References: In-Reply-To:Content-Type:Cc; b=vZ4VWZoaSVwMpKnH2scBsLiwciWSoOYQM2xnkbwsx9azDGvXkj2vGtIDx7Acw70Ua 6UDJy/HWHjMT0ZXZvCU3l7fCPO3yNru+RYBXBtnZbBfN0HPEeWIaDEyY7RA8+sYFkK Ylt2pPc0VDu4hsegKzeR9uCXNJFGZu/EldoI5/7c= Message-ID: <4F3FA9FB.7030203@infracaninophile.co.uk> Date: Sat, 18 Feb 2012 13:39:07 +0000 From: Matthew Seaman User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <4F3ECF23.5000706@fisglobal.com> <20120217234623.cf7e169c.freebsd@edvax.de> <3D08D03C85ACFBB1ABCDC5DA@mac-pro.magehandbook.com> <20120218112252.772c878b.freebsd@edvax.de> <4F3F80FD.8070201@herveybayaustralia.com.au> <4F3F8A46.1090908@infracaninophile.co.uk> <4F3F8D39.80907@herveybayaustralia.com.au> In-Reply-To: <4F3F8D39.80907@herveybayaustralia.com.au> X-Enigmail-Version: 1.3.5 OpenPGP: id=60AE908C Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig58FFAF7E41CD9A1CA5BE0288" X-Virus-Scanned: clamav-milter 0.97.3 at lucid-nonsense.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-2.7 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU autolearn=ham version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on lucid-nonsense.infracaninophile.co.uk Subject: Re: /usr/home vs /home X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 Feb 2012 13:39:19 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig58FFAF7E41CD9A1CA5BE0288 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 18/02/2012 11:36, Da Rock wrote: > If I may, can I ask a quick question: My main misgivings about ZFS have= > been speed, ram use, and up till about a year ago or so relative 'youth= ' > (at least on FreeBSD). What would be the minimum ram you would use for = a > high disk use? And what would be recommended to use for the caching? I > was thinking 8G ram and either a high quality usb/SD(/CF?) disk or a > sata II/III SSD for cache. Yes -- ZFS uses RAM heavily to improve performance. I've a VM running ZFS with only 1GB which is pretty slow. Mind you, a similar VM with UFS is also pretty slow. For an actual machine, about 4GB makes a reasonable ZFS system. More is better though; 8GB is what I'd recommend. ZFS speed is on the whole pretty reasonable. It doesn't do small, randomized IO very effectively, so it's not ideal to run a database on. Other than that, for a home e-mail / web /fileserver ZFS is just fine. I haven't tried SSDs or anything like that -- that's an optimization to improve latency when accessing lots of different files, and my usage doesn't really justify it. Try it without before spending any money on SSDs. It may well be good enough, but if it isn't then adding SSDs and making ZFS use them for ZIL or cache is pretty simple (and doesn't require any downtime.) Cheers, Matthew --=20 Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate JID: matthew@infracaninophile.co.uk Kent, CT11 9PW --------------enig58FFAF7E41CD9A1CA5BE0288 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.16 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk8/qgIACgkQ8Mjk52CukIwbogCfd0iEtDNt5/8IyZ2Vwi1GvFhS UtIAniyVAA1bygLQmu5QU/EuBAKkUoen =OVI6 -----END PGP SIGNATURE----- --------------enig58FFAF7E41CD9A1CA5BE0288--