From owner-freebsd-fs@freebsd.org Mon Jan 21 06:22:48 2019 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 664C71491C06 for ; Mon, 21 Jan 2019 06:22:48 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from anubis.delphij.net (anubis.delphij.net [IPv6:2001:470:1:117::25]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits)) (Client CN "anubis.delphij.net", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id AF7496FFC5 for ; Mon, 21 Jan 2019 06:22:47 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from odin.corp.delphij.net (unknown [IPv6:2601:646:8882:37a:8c4c:9b29:ea1d:db2b]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by anubis.delphij.net (Postfix) with ESMTPSA id 330FE3CD2F; Sun, 20 Jan 2019 22:22:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=delphij.net; s=m7e2; t=1548051766; x=1548066166; bh=/7IwP03AM48cbQh/hvvCoA7Z/fyq91jjSZVR5xb5ZeU=; h=Reply-To:To:References:From:Subject:Date:In-Reply-To; b=HodjMZLwrn6qO8hTDiWCZ3I3CmrCIPnoJQyH2oqCgf3x+T0QuBVcoF9QnMOESk+Z8 NG3doJVLM2Gko7dKIGLV2nF5GKxApROnXXm92EYeeDfcW8rBFsonEiQ1PtRsgwyN2b rkgzqxjAjrqgrL5hnQFgQVG2I9i76UeYt1JDDWJO4nwD8+sLUrAEERksMgjRJE4qeR vnEdwIm4iZNJbDXynnM6cWw+AJO2UpATWky868LtAK+HxnO/BAo5KDfcLET6WayGHM U3v5a/5wsH4InR6j3gG7wMO0HLN/ZZAHLRWddxCT+8Ae3qFZbgmMCrSLJf2vY/zh2o sVJO/AAhzsb/A== Reply-To: d@delphij.net To: Ben RUBSON , freebsd-fs References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net> <7C7F0DBB-C751-433A-BCB7-4EBE71BB821D@gmail.com> <9ea95f3d-6ccd-00d7-4234-b57a318f8bfe@FreeBSD.org> From: Xin Li Openpgp: preference=signencrypt Autocrypt: addr=delphij@delphij.net; 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micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="CZIs7L7tg3boVkOEnqLSZpgrt7xhLqkr2" X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jan 2019 06:22:48 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --CZIs7L7tg3boVkOEnqLSZpgrt7xhLqkr2 Content-Type: multipart/mixed; boundary="fHoqTNCrIghaCPjLq8ni3uIq3ZPUBOzvY"; protected-headers="v1" From: Xin Li Reply-To: d@delphij.net To: Ben RUBSON , freebsd-fs Message-ID: <835a17ca-a2b4-0bc1-a5ec-3e687450789e@delphij.net> Subject: Re: ZFS on Hardware RAID References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net> <7C7F0DBB-C751-433A-BCB7-4EBE71BB821D@gmail.com> <9ea95f3d-6ccd-00d7-4234-b57a318f8bfe@FreeBSD.org> In-Reply-To: <9ea95f3d-6ccd-00d7-4234-b57a318f8bfe@FreeBSD.org> --fHoqTNCrIghaCPjLq8ni3uIq3ZPUBOzvY Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 1/20/19 13:33, Andriy Gapon wrote: > On 20/01/2019 17:41, Ben RUBSON wrote: >> ZFS does not really make sense with only one disk (what's the checksum= >> benefit once it has failed ?), you could go with any other FS... With checksums, you can tell if a file is corrupted. On traditional filesystems, you can only tell when there is built-in integrity checks, or you actually notice the file getting garbled (and it's probably too late at the time). > There is 'copies' property, though... Also multiple copies of critical metadata is stored by default. I actually got saved on an old laptop (crappy hardware, no ECC RAM, etc.) a few years ago, copying the disk to the replacement and a 'zpool scrub' corrected everything for me. It's not a replacement for an up-to-date backup, and it won't save you from a dead disk, but it can be very helpful for "usual" situations where you have a backup from a few days ago and a hard drive that is not totally dead, yet. Cheers, --fHoqTNCrIghaCPjLq8ni3uIq3ZPUBOzvY-- --CZIs7L7tg3boVkOEnqLSZpgrt7xhLqkr2 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJcRWU1AAoJEEB5f3yV9INP7x0P/RsdtvdgNj3Om/zeZEUxy51z 4XU/pKHxgSZiJjKovfX+Fw9ScsTsGolgYGo/aWLJLKPDyNYyFaZdltiW5QbJVbXO +V7FulBDaV2bGreTQAYQ+Y++ZVxf7/gMNKPaf3kD68vn8W9fAU/um2k+Cmezmkjb vJIgtnmdebHpfflnSOIaYkpf7JvMT/DuBGpaCGt3XBu47ujnPb3l8AqUEE7y1iba Hs3l0GCBrQuAoSl9TmdRScLZ4dd/t92Fww1TXpBqEk5CMVhP4TpZ0r77FHO4xidQ Vsj11A4SuYTW37+dBflJ8yKO4ipXFLJ1QO/Ti0oVNsDNEstJnVU4EAoMGgRlE44R +C+MhUBb/s01lE586pRkymbdk6QDbRU5Jyl4d/wJtEG4TF0bRLJaWA33E8858PCX 2AX66jqasuvzTV1zD2VvA7za/qhKsUf8V6J//Ervifacx+L2iyBUdEON3IuyofHA 7iMS3oA3lRUO6F4/rMKCL/UkGePEoILdjoIfzy5yL67303BSWrfEiCZU0fb2pkvv Aet7cz3Wwd4Ouj80iwIxNA5kiHvRHjH2Yoz3OJjQ48IkgpELYLHJsBPoR7eEkt19 H2UuvvkeiJ4BcfxdxEZG4YHpeaNNcovsXqIeWE7wwVHphGMmskH67orfXiEdKJ/i zTgi5Jq2yut3BWaLOTh5 =gVhc -----END PGP SIGNATURE----- --CZIs7L7tg3boVkOEnqLSZpgrt7xhLqkr2--