From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carsten Aulbert Subject: Re: Use RAID-6! Date: Tue, 16 Apr 2013 22:05:53 +0200 Message-ID: <516DAF21.5040409@aei.mpg.de> References: <15345091.8.1366130671716.JavaMail.root@zimbra> <516DABF2.5050409@tigertech.com> Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms020406070400030102050706" Return-path: In-Reply-To: <516DABF2.5050409@tigertech.com> Sender: linux-raid-owner@vger.kernel.org To: Robert L Mathews Cc: Linux RAID List-Id: linux-raid.ids This is a cryptographically signed message in MIME format. --------------ms020406070400030102050706 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi On 04/16/2013 09:52 PM, Robert L Mathews wrote: > I personally don't even trust RAID 6. All our servers use three-disk > RAID 1 setups, with disks from at least two different manufacturers to > prevent against firmware bricking (although this is becoming more and > more difficult as the industry consolidates). The problem I find with RAID1 is that it won't protect you against silent corruptions (same as RAID5). What do you do if you do a through check and both drives claim a data block is valid and intact, but data differs? Do you trust disk1 or disk2? In that respect I think RAID1 is a step into the wrong direction :( Cheers Carsten --------------ms020406070400030102050706 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIE8DCC BOwwggPUoAMCAQICAkMDMA0GCSqGSIb3DQEBBQUAMDYxCzAJBgNVBAYTAkRFMRMwEQYDVQQK EwpHZXJtYW5HcmlkMRIwEAYDVQQDEwlHcmlkS2EtQ0EwHhcNMTIwNTAyMTQwMjI1WhcNMTMw NjAxMTQwMjI1WjA9MRMwEQYDVQQKEwpHZXJtYW5HcmlkMQwwCgYDVQQLEwNBRUkxGDAWBgNV BAMTD0NhcnN0ZW4gQXVsYmVydDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAOuh d5sXP9180l8F34z/ywkRt/cVUoZjHh4bumhIZbz8O+PQ6QDI8mbgFwoDPQAmmEs4lKV8F0Ur gRls+gEob+JybAepOFiZVa1YnLRnnvNcpKwi0fs7MIpvqUxCacIcc63UTD8A4/1N74zE2KpZ g1TDqaW5ypQpKk9bUXBnhrg19j5PN1Ch2DRPO9jzJXW13uRL1OfNoOZoANHheegtfCj1mwzp 2naGvZea0EpqndKfUUHBrg9OQIwQJemXhWiJzJMv27l93+uSfvy2zvNXgXDFZr40p33Vx07C OD8UI0vela6idGxzwJ74aoQpvp7dSUEIgVFCgXCCXgvY/FxXk6UCAwEAAaOCAfswggH3MAwG A1UdEwEB/wQCMAAwDgYDVR0PAQH/BAQDAgSwMB0GA1UdDgQWBBSFaeVx9/3sSuG3fOgfU56/ LWDaKzAfBgNVHSMEGDAWgBTGdckorNEL/Dz/ubUe0187gGISNDAlBgNVHREEHjAcgRpDYXJz dGVuLkF1bGJlcnRAYWVpLm1wZy5kZTAcBgNVHRIEFTATgRFncmlka2EtY2FAa2l0LmVkdTA1 BgNVHR8ELjAsMCqgKKAmhiRodHRwOi8vZ3JpZC5memsuZGUvY2EvZ3JpZGthLWNybC5kZXIw KAYDVR0gBCEwHzAPBg0rBgEEAZQ2qywBAQEHMAwGCiqGSIb3TAUCAgEwEQYJYIZIAYb4QgEB BAQDAgWgME4GCWCGSAGG+EIBDQRBFj9DZXJ0aWZpY2F0ZSBpc3N1ZWQgdW5kZXIgQ1AvQ1BT IHYuIDEuNyBhdCBodHRwOi8vZ3JpZC5memsuZGUvY2EwJAYJYIZIAYb4QgECBBcWFWh0dHA6 Ly9ncmlkLmZ6ay5kZS9jYTAzBglghkgBhvhCAQgEJhYkaHR0cDovL2dyaWQuZnprLmRlL2Nh L2dyaWRrYS1jcHMucGRmMDMGCWCGSAGG+EIBAwQmFiRodHRwOi8vZ3JpZC5memsuZGUvY2Ev Z3JpZGthLWNybC5kZXIwDQYJKoZIhvcNAQEFBQADggEBABK8nPkhGS1HzzGlCfI5CaFT19za d0H3tGc5OueBHxBO8DWyB3M1v1YyaOEDEvkL1Y1+RDAnYvoXgvgBQnGMWuy4SEnMpm1wIIMs pFM1Q1pPqJ+GdwYdmkwkVy4fs8TkDAy6AYkoGa7Cnxai1KlLHtxCS26uIiUcEhSmdMZOQT4w rYbtX1mQGZpg4BJ8YgjP1oazYCiHaQcumVYSOHb+HJQuAy35eBr6/82OHrF28V+UoN9EYuU7 1RqAS9dtP6i7z34V7Tlx0zyzL99IyF5ZZMF6a18q7K9jrkXlTRYYcpGMMeH51XGe5hB1az5o fR7i8PzrlBwH5cn5BHDfjWHbcOgxggLOMIICygIBATA8MDYxCzAJBgNVBAYTAkRFMRMwEQYD VQQKEwpHZXJtYW5HcmlkMRIwEAYDVQQDEwlHcmlkS2EtQ0ECAkMDMAkGBSsOAwIaBQCgggFn MBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTEzMDQxNjIwMDU1 M1owIwYJKoZIhvcNAQkEMRYEFEIxXKjIWp1toIqec9TZwA79+oTCMEsGCSsGAQQBgjcQBDE+ MDwwNjELMAkGA1UEBhMCREUxEzARBgNVBAoTCkdlcm1hbkdyaWQxEjAQBgNVBAMTCUdyaWRL YS1DQQICQwMwTQYLKoZIhvcNAQkQAgsxPqA8MDYxCzAJBgNVBAYTAkRFMRMwEQYDVQQKEwpH ZXJtYW5HcmlkMRIwEAYDVQQDEwlHcmlkS2EtQ0ECAkMDMGwGCSqGSIb3DQEJDzFfMF0wCwYJ YIZIAWUDBAEqMAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYI KoZIhvcNAwICAUAwBwYFKw4DAgcwDQYIKoZIhvcNAwICASgwDQYJKoZIhvcNAQEBBQAEggEA D9npylfnl/Dg75CWFZ3SFTp/cWA/9kAQKBNNgMG0TxapR+CAsQUMX2cPQg3sImupl3zXe1MX b9nIrfp0kUEqCRN3igr28Sn9tL/iTmpFnazU5oPZ/a3UOjNhz1IfWR0Q+WjvSINLEwS8TdDa w9YfYbZIK0KR4rcCCXWKO/4DCaHTccLKNgNFLcm/4OZJ9GOWJajgI8vcEK4t0ndDNXy1J6Sx nCuuhlZEkRpYZd9gdpjXK6fpGGrEqLaHK/hr95bmBKKXIus9gHsUCSa8Wonh3isV610zYzqj P+jS2V2swjRbC4Obv6YsWtd4rX60qhuC3F85QG/iiFrNFtJyj0wkLQAAAAAAAA== --------------ms020406070400030102050706--