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Fri, 1 Feb 2019 13:45:56 -0500 (EST) Subject: Re: RAID56 Warning on "multiple serious data-loss bugs" To: Chris Murphy , linux-btrfs References: <5d7f63b2-d340-7c3a-679b-26e97ac258a6@gmail.com> <59a60289-1130-27b4-960b-9014fc8d68e8@gmx.com> <36be9ca6-4aa0-f00a-c1b4-a59026a1909e@georgianit.com> From: Remi Gauvin Openpgp: url=http://www.georgianit.com/pgp/Remi%20Gauvin%20remi%40georgianit.com%20(0xEF539FF247456A6D)%20pub.asc Autocrypt: addr=remi@georgianit.com; prefer-encrypt=mutual; keydata= mQENBFogjcYBCADvI0pxdYyVkEUAIzT6HwYnZ5CAy2czT87Si5mqk4wL4Ulupwfv9TLzaj3R CUgHPNpFsp1n/nKKyOq1ZmE6w5YKx4I8/o9tRl+vjnJr2otfS7XizBaVV7UwziODikOimmT+ sGNfYGcjdJ+CC567g9aAECbvnyxNlncTyUPUdmazOKhmzB4IvG8+M2u+C4c9nVkX2ucf3OuF t/qmeRaF8+nlkCMtAdIVh0F7HBYJzvYG3EPiKbGmbOody3OM55113uEzyw39k8WHRhhaKhi6 8QY9nKCPVhRFzk6wUHJa2EKbKxqeFcFzZ1ok7l7vrX3/OBk2dGOAoOJ4UX+ozAtrMqCBABEB AAG0IVJlbWkgR2F1dmluIDxyZW1pQGdlb3JnaWFuaXQuY29tPokBPgQTAQIAKAUCWiCNxgIb IwUJCWYBgAYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AACgkQ71Of8kdFam2V1Qf9Fs6LSx1i OoVgOzjWwiI06vJrZznjmtbJkcm/Of5onITZnB4h+tbqEyaMYYsEIk1r4oFMfKB7SDpQbADj 9CI2EbpygwZa24Oqv4gWEzb4c7mSJuLKTnrhmwCOtdeDQXO/uu6BZPkazDAaKHUM6XqNEVvt WHBaGioaV4dGxzjXALQDpLc4vDreSl9nwlTorwJR9t6u5BlDcdh3VOuYlgXjI4pCk+cihgtY k3KZo/El1fWFYmtSTq7m/JPpKZyb77cbzf2AbkxJuLgg9o0iVAg81LjElznI0R5UbYrJcJeh Jo4rvXKFYQ1qFwno1jlSXejsFA5F3FQzJe1JUAu2HlYqRrkBDQRaII3GAQgAo0Y6FX84QsDp R8kFEqMhpkjeVQpbwYhqBgIFJT5cBMQpZsHmnOgpYU0Jo8P3owHUFu569g6j4+wSubbh2+bt WL0QoFZcng0a2/j3qH98g9lAn8ZgohxavmwYINt7b+LEeDoBvq0s/0ZeXx47MOmbjROq8L/g QOYbIWoJLO2emyxmVo1Fg00FKkbuCEgJPW8U/7VX4EFYaIhPQv/K3mpnyWXIq5lviiMCHzxE jzBh/35DTLwymDdmtzWgcu1rzZ6j2s+4bTxE8mYXd4l2Xonn7v448gwvQmZJ8EPplO/pWe9F oISyiNxZnQNCVEO9lManKPFphfVHqJ1WEtYMiLxTkQARAQABiQElBBgBAgAPBQJaII3GAhsM BQkJZgGAAAoJEO9Tn/JHRWptnn0H+gOtkumwlKcad2PqLFXCt2SzVJm5rHuYZhPPq4GCdMbz XwuCEPXDoECFVXeiXngJmrL8+tLxvUhxUMdXtyYSPusnmFgj/EnCjQdFMLdvgvXI/wF5qj0/ r6NKJWtx3/+OSLW0E9J/gLfimIc3OF49E3S1c35Wj+4Okx9Tpwor7Tw8KwBVbdZA6TyQF08N phFkhgnTK6gl2XqIHaoxPKhI9pKU5oPkg2eI27OICZrpTCppaSh3SGUp0EHPkZuhVfIxg4vF nato30VZr+RMHtPtx813VZ/kzj+2pC/DrwZOtqFeaqJfCi6JSik3vX9BQd9GL4mxytQBZKXz SY9JJa155sI= Message-ID: <36f81db3-7346-482d-9e13-7365d647afbc@georgianit.com> Date: Fri, 1 Feb 2019 13:45:55 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="V44Rzyj2xRqxLZJCOXsboxJHOBU0eyZxM" Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --V44Rzyj2xRqxLZJCOXsboxJHOBU0eyZxM Content-Type: multipart/mixed; boundary="zrrpcwwA6vLQig4X2IaV4gS98QcFFrBCu"; protected-headers="v1" From: Remi Gauvin To: Chris Murphy , linux-btrfs Message-ID: <36f81db3-7346-482d-9e13-7365d647afbc@georgianit.com> Subject: Re: RAID56 Warning on "multiple serious data-loss bugs" References: <5d7f63b2-d340-7c3a-679b-26e97ac258a6@gmail.com> <59a60289-1130-27b4-960b-9014fc8d68e8@gmx.com> <36be9ca6-4aa0-f00a-c1b4-a59026a1909e@georgianit.com> In-Reply-To: --zrrpcwwA6vLQig4X2IaV4gS98QcFFrBCu Content-Type: multipart/mixed; boundary="------------2FEDCF81380D0C275BC7A422" Content-Language: en-US This is a multi-part message in MIME format. --------------2FEDCF81380D0C275BC7A422 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 2019-01-29 2:02 p.m., Chris Murphy wrote: >=20 > There's no dirty bit set on mount, and thus no dirty bit to unset on > clean mount, from which to infer a dirty unmount if it's present at > the next mount. Some time back, i was toying with the idea of a Startup script that creates a /need_scrub file, paired with a daily nightly script that checks for that file and runs scrub if found. That way, if the system ever ended up re-started without admin intervention, a scrub would be run that very night. But I've decided against using BTRFS parity raid until I can get working 2 device failure with no write hole. Either with Metadata Raid 1 N3 (what's the correct way to say that?) or Raid 6 that's write hole proof. --------------2FEDCF81380D0C275BC7A422 Content-Type: text/x-vcard; charset=utf-8; name="remi.vcf" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="remi.vcf" begin:vcard fn:Remi Gauvin n:Gauvin;Remi org:Georgian Infotech adr:;;3-51 Sykes St. N.;Meaford;ON;N4L 1X3;Canada email;internet:remi@georgianit.com tel;work:226-256-1545 version:2.1 end:vcard --------------2FEDCF81380D0C275BC7A422-- --zrrpcwwA6vLQig4X2IaV4gS98QcFFrBCu-- --V44Rzyj2xRqxLZJCOXsboxJHOBU0eyZxM Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJcVJPjAAoJEO9Tn/JHRWpt7IIH/jYGAdHiUTuAsLDTF9cmrFhY 40EUFgEvhUZEbwtoTN9ndQLbzW9el1NPRIKW1GvqtZNwIqNViIeptmcIWexV0K8h DsqTtb9biZpdxlUHXHTe9uzg3wjdKLtiyMUH6t/cDa1/ghhGHNrwcHJVwwNC6hk6 MlTxffDC+EnoTF6M8VnLDk6RwNGR4J/s8BnbiH/F6VdyAec9MVVxmMAqi3SGgdeF miX6ZGwWNYVbyIGZC3u5XE4w0GnKSX9OdDwmTp6RC6NYlg7B7kKbc9mrQLEDxa7p A7w0b++i0c4FV/TRUAM7+eR021mJLM9gJphGWXFH9jFzZZGneF1SfMvjWjAgQY8= =ciMB -----END PGP SIGNATURE----- --V44Rzyj2xRqxLZJCOXsboxJHOBU0eyZxM--