From owner-freebsd-questions@FreeBSD.ORG Wed Aug 8 07:08:02 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 37192106566B for ; Wed, 8 Aug 2012 07:08:02 +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 B56A18FC08 for ; Wed, 8 Aug 2012 07:08:01 +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 q7877vQJ072503 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO) for ; Wed, 8 Aug 2012 08:07:58 +0100 (BST) (envelope-from m.seaman@infracaninophile.co.uk) X-DKIM: OpenDKIM Filter v2.5.2 smtp.infracaninophile.co.uk q7877vQJ072503 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=infracaninophile.co.uk; s=201001-infracaninophile; t=1344409678; bh=8CHaubGkNk9iArz1PyBU5bwwEY1Jmcu6ZYGAE2PKquw=; h=Date:From:To:Subject:References:In-Reply-To:Cc:Content-Type: Message-ID:Mime-Version; b=iAHePPL6Mv0YVkpowe7TN2Mdv6Y62qdo6I6nTfeeFFJIe9mVwc6nJHkOHKA7W25Sr 4ZfHVY5EnQM0dvTHt/ql4jICnxa8h2T+awyCrlF74baM9KynNqu0iWAiNfmSl4vGEt kYbgLTBgplU9EUaVLQtMp9zddi9aW7SuZo7wyEV4= Message-ID: <5022104D.8070402@infracaninophile.co.uk> Date: Wed, 08 Aug 2012 08:07:57 +0100 From: Matthew Seaman User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <793d6519ca3648de7634faff1829b9f7@remailer.privacy.at> <5021641E.4030206@une.net.co> In-Reply-To: X-Enigmail-Version: 1.4.3 OpenPGP: id=60AE908C Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigA5195D1E6F5489F17009C545" X-Virus-Scanned: clamav-milter 0.97.5 at lucid-nonsense.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00, DKIM_ADSP_ALL,DKIM_SIGNED,T_DKIM_INVALID autolearn=no version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on lucid-nonsense.infracaninophile.co.uk Subject: Re: compare zfs xfs and jfs o 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: Wed, 08 Aug 2012 07:08:02 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigA5195D1E6F5489F17009C545 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 07/08/2012 22:09, Wojciech Puchar wrote: > Of course "ZFS doesn't need fsck". Until it fails. It doesn't need fsck for the normal case of filesystem corruption due to system crashes: in that case, you stand to lose maybe the last one or two IO transactions that hadn't made it onto the disk yet, but the data that was already on the disk will still be consistent. Needing fsck because the drive is failing and not able to store and retrieve data reliably any more is a whole different thing. ZFS at least will discover that this is happening due to the built-in checksumming and avoid many instances of silent corruption. What it can't do is take a filesystem containing random errors and reconstruct a pristine version from it. But then what filesystem can? 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 --------------enigA5195D1E6F5489F17009C545 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/ iEYEARECAAYFAlAiEE0ACgkQ8Mjk52CukIxjCACeM+r4AQeOZJEb2VS5+aLViWxH oTAAnA6JfAyR+0P6NltF2J+xAWGzNrPd =UUAZ -----END PGP SIGNATURE----- --------------enigA5195D1E6F5489F17009C545--