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Sat, 26 Jan 2019 09:05:09 -0500 (EST) Subject: Re: RAID56 Warning on "multiple serious data-loss bugs" To: waxhead@dirtcellar.net, linux-btrfs References: <5d7f63b2-d340-7c3a-679b-26e97ac258a6@gmail.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: Date: Sat, 26 Jan 2019 09:05:08 -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="8RDohAP96JttrJZM5ZfRVWmpeTnMvap7B" 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) --8RDohAP96JttrJZM5ZfRVWmpeTnMvap7B Content-Type: multipart/mixed; boundary="hRdVouvSEiwKv30KS7ouPaAMWhiI6hj1c"; protected-headers="v1" From: Remi Gauvin To: waxhead@dirtcellar.net, linux-btrfs Message-ID: Subject: Re: RAID56 Warning on "multiple serious data-loss bugs" References: <5d7f63b2-d340-7c3a-679b-26e97ac258a6@gmail.com> In-Reply-To: --hRdVouvSEiwKv30KS7ouPaAMWhiI6hj1c Content-Type: multipart/mixed; boundary="------------DF448B5033CD64C402FC9282" Content-Language: en-US This is a multi-part message in MIME format. --------------DF448B5033CD64C402FC9282 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 2019-01-26 7:07 a.m., waxhead wrote: >=20 > What effect exactly the write hole might have on *data* is not pointed > out in detail, but I would imagine that for some it might be desirable > to run a btrfs filesystem with metadata in "RAID" 1/10 mode and data in= > "RAID" 5/6. >=20 One big problem here is that neither Raid 1 nor Raid 10 currently have configurable # of Mirrors, (N devices), so it's impossible to get 2 device failure redundancy. (No point in using Raid 6 then, that's just wasting space.) --------------DF448B5033CD64C402FC9282 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 --------------DF448B5033CD64C402FC9282-- --hRdVouvSEiwKv30KS7ouPaAMWhiI6hj1c-- --8RDohAP96JttrJZM5ZfRVWmpeTnMvap7B 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 iQEcBAEBCAAGBQJcTGkUAAoJEO9Tn/JHRWptYU4H/25ZuxTrXk9yibCU4uBcpdy3 Hvf1dyJYLA9tDd/X2Ww8m2un+rWPfg7wN4+vyViCjEOuGyHZFsY55O/B03caINjn dIiU0Q1Cy1FELQtWya7fY8Bn5q0nMLHTj5WPxl0oMgZXukAbqzhztk5PPvPTDjvf VnQKqtf7hL4sPyl9b2lHBLQDpBSJk1nZSAce9/6Z0CrUfsey2n55qjbt/4Z3r2Vj TDShDYGHz/kVd25oVLD3qzm3H0av0FrlIJJt0mHoM2SATCAXIG68fmSrILiXILzZ AXz6GbYgGtnec40lKaJouV5VpQYf/n+HTFlBvsdEIQd/NvjOrrVtp9qlPWbRc34= =yIRE -----END PGP SIGNATURE----- --8RDohAP96JttrJZM5ZfRVWmpeTnMvap7B--