Date: Sun, 20 Jan 2019 22:22:41 -0800 From: Xin Li <delphij@delphij.net> To: Ben RUBSON <ben.rubson@gmail.com>, freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZFS on Hardware RAID Message-ID: <835a17ca-a2b4-0bc1-a5ec-3e687450789e@delphij.net> In-Reply-To: <9ea95f3d-6ccd-00d7-4234-b57a318f8bfe@FreeBSD.org> References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> <CAOeNLurgn-ep1e=Lq9kgxXK%2By5xqq4ULnudKZAbye59Ys7q96Q@mail.gmail.com> <alpine.BSF.2.21.1901200834470.12592@mail0.time-domain.co.uk> <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net> <CAOeNLuqQDJ3O1DgzdkshhiJVXd=6aPCMn86BOSwsJLZRdz21aw@mail.gmail.com> <7C7F0DBB-C751-433A-BCB7-4EBE71BB821D@gmail.com> <9ea95f3d-6ccd-00d7-4234-b57a318f8bfe@FreeBSD.org>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --CZIs7L7tg3boVkOEnqLSZpgrt7xhLqkr2 Content-Type: multipart/mixed; boundary="fHoqTNCrIghaCPjLq8ni3uIq3ZPUBOzvY"; protected-headers="v1" From: Xin Li <delphij@delphij.net> Reply-To: d@delphij.net To: Ben RUBSON <ben.rubson@gmail.com>, freebsd-fs <freebsd-fs@freebsd.org> 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> <CAOeNLurgn-ep1e=Lq9kgxXK+y5xqq4ULnudKZAbye59Ys7q96Q@mail.gmail.com> <alpine.BSF.2.21.1901200834470.12592@mail0.time-domain.co.uk> <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net> <CAOeNLuqQDJ3O1DgzdkshhiJVXd=6aPCMn86BOSwsJLZRdz21aw@mail.gmail.com> <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--
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