From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f181.google.com ([209.85.213.181]:36441 "EHLO mail-ig0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750958AbbHRLnH (ORCPT ); Tue, 18 Aug 2015 07:43:07 -0400 Received: by igxp17 with SMTP id p17so78288109igx.1 for ; Tue, 18 Aug 2015 04:43:06 -0700 (PDT) Subject: Re: Btrfs is amazing! (a lack-of-bug report) To: Tyler Bletsch , linux-btrfs@vger.kernel.org References: <55D1567B.3030809@gmail.com> <55D1CA1E.1060103@gmail.com> <55D23397.6090404@gmail.com> From: Austin S Hemmelgarn Message-ID: <55D31A3C.3080208@gmail.com> Date: Tue, 18 Aug 2015 07:42:52 -0400 MIME-Version: 1.0 In-Reply-To: <55D23397.6090404@gmail.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms090603010503080504000002" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms090603010503080504000002 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-08-17 15:18, Tyler Bletsch wrote: > Thanks. I will be trying raid5 in production, but "production" in this > case just means my home file server, with btrfs snapshot+sync for all > data and appropriate offsite non-btrfs backups for critical data. If it= > hoses up, I'll post a bug report. So far, that's been my use case for btrfs raid6, and (barring one bug I=20 found involving an interaction between btrfs and thinly provisioned=20 storage that shouldn't be an issue for you if you're not using LVM thin=20 pools) I have yet to hit any bugs, although based on the lists, I've=20 probably been _very_ lucky in that respect. If you're willing to take a = marginal performance hit (about 1-3% in my experience, which is notably=20 less than the performance difference between MD-RAID5 and MD-RAID6), and = have at least four disks, I'd suggest using btrfs's raid6 profile=20 instead of raid5, they use exactly the same code, it's just that raid6=20 has one more calculation involved and provides better protection against = data corruption due to the double parity. > > Going to try to avoid LVM, since half the appeal of btrfs for me is > getting away from the multiple duct-taped layers of indirection that I > you get currently with ext4/MD/LVM setups. Understandable, my main reasons for having LVM are storing virtual=20 machine disk images and the fact that MD/DM raid is still ridiculously=20 fast compared to btrfs raid (many of my btrfs raid volumes are=20 themselves on top of LVM managed software raid0 or raid1 volumes). --------------ms090603010503080504000002 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC Brgwgga0MIIEnKADAgECAgMQblUwDQYJKoZIhvcNAQENBQAweTEQMA4GA1UEChMHUm9vdCBD QTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNp Z25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcwHhcN MTUwMzI1MTkzNDM4WhcNMTUwOTIxMTkzNDM4WjBjMRgwFgYDVQQDEw9DQWNlcnQgV29UIFVz ZXIxIzAhBgkqhkiG9w0BCQEWFGFoZmVycm9pbjdAZ21haWwuY29tMSIwIAYJKoZIhvcNAQkB FhNhaGVtbWVsZ0BvaGlvZ3QuY29tMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA nQ/81tq0QBQi5w316VsVNfjg6kVVIMx760TuwA1MUaNQgQ3NyUl+UyFtjhpkNwwChjgAqfGd LIMTHAdObcwGfzO5uI2o1a8MHVQna8FRsU3QGouysIOGQlX8jFYXMKPEdnlt0GoQcd+BtESr pivbGWUEkPs1CwM6WOrs+09bAJP3qzKIr0VxervFrzrC5Dg9Rf18r9WXHElBuWHg4GYHNJ2V Ab8iKc10h44FnqxZK8RDN8ts/xX93i9bIBmHnFfyNRfiOUtNVeynJbf6kVtdHP+CRBkXCNRZ qyQT7gbTGD24P92PS2UTmDfplSBcWcTn65o3xWfesbf02jF6PL3BCrVnDRI4RgYxG3zFBJuG qvMoEODLhHKSXPAyQhwZINigZNdw5G1NqjXqUw+lIqdQvoPijK9J3eijiakh9u2bjWOMaleI SMRR6XsdM2O5qun1dqOrCgRkM0XSNtBQ2JjY7CycIx+qifJWsRaYWZz0aQU4ZrtAI7gVhO9h pyNaAGjvm7PdjEBiXq57e4QcgpwzvNlv8pG1c/hnt0msfDWNJtl3b6elhQ2Pz4w/QnWifZ8E BrFEmjeeJa2dqjE3giPVWrsH+lOvQQONsYJOuVb8b0zao4vrWeGmW2q2e3pdv0Axzm/60cJQ haZUv8+JdX9ZzqxOm5w5eUQSclt84u+D+hsCAwEAAaOCAVkwggFVMAwGA1UdEwEB/wQCMAAw VgYJYIZIAYb4QgENBEkWR1RvIGdldCB5b3VyIG93biBjZXJ0aWZpY2F0ZSBmb3IgRlJFRSBo ZWFkIG92ZXIgdG8gaHR0cDovL3d3dy5DQWNlcnQub3JnMA4GA1UdDwEB/wQEAwIDqDBABgNV HSUEOTA3BggrBgEFBQcDBAYIKwYBBQUHAwIGCisGAQQBgjcKAwQGCisGAQQBgjcKAwMGCWCG SAGG+EIEATAyBggrBgEFBQcBAQQmMCQwIgYIKwYBBQUHMAGGFmh0dHA6Ly9vY3NwLmNhY2Vy dC5vcmcwMQYDVR0fBCowKDAmoCSgIoYgaHR0cDovL2NybC5jYWNlcnQub3JnL3Jldm9rZS5j cmwwNAYDVR0RBC0wK4EUYWhmZXJyb2luN0BnbWFpbC5jb22BE2FoZW1tZWxnQG9oaW9ndC5j b20wDQYJKoZIhvcNAQENBQADggIBABr5e8W+NiTER+Q/7wiA2LxWN3UdhT3eZJjqqSlP370P KL5iWqeTfxQ67Ai/mHbJcT2PgAJ+/D2Ji+aRR03UWnU/vtOwzyDLUMstqnfl0Zs+sz/CJe7x nBA5jlpjC2DKuMVfbPze7eySaen7XSGFHKE1QoVIIpQ2kVjC4nbbJQnUbAVX1Iz29WxeVGt9 XYigz3tDPf3tglN+q23E7YjQl4abTIoM7i98yV1H9gfY8lFfKZ6jREB9+n6ie2EwS3Kat2mG tl2wBx4MfRnoSQSKsLKQ5oTwhWf0JqlFwpLfl374p0Njcykej9/jnWG8Ks1V/AXTHqI4eyIP Mf5yMZkPv7n7LS9WWKdG4Nd38iv4T2EiAaWsmgu+r81qL5CJu9AyA0SBS4ttKf6k3e63w2Mv N9R45vpQ3QhAhfWyFxFhZN95APe3YECDG3+XIRJpRYPEtHuIsOyzI70ajF93gg/BidvqKsmV MM2ccktDMfqwZXea6zey7F8Geu9R7BqjXmG2HlNuXu7e/xnHOgXf5D3wPmnRLlBhXL1Ch97a w2KjaupjpAHfFjv5kGnZXN87UvvlwzIZiKXwa3vTDwK+rrKn/sHPkfDZPSiyt/ZBIK6lX83P 34H/CzGg+Kx57rHYOIHGumIvpDa5vfWp8O0sGgawb1C2Aae4sTUVIWmIjVuGI062MYIE0TCC BM0CAQEwgYAweTEQMA4GA1UEChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNl cnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcN AQkBFhJzdXBwb3J0QGNhY2VydC5vcmcCAxBuVTANBglghkgBZQMEAgMFAKCCAiEwGAYJKoZI hvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTUwODE4MTE0MjUyWjBPBgkq hkiG9w0BCQQxQgRAsykLASHinjPdKk5EV+fG6fWeMHccAPQgXKSdGXYknABDKc91Z9FzRb3G vK0oHhsnHG0kGz4pmgwXiczta4dCWzBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIGRBgkrBgEEAYI3EAQxgYMwgYAweTEQMA4GA1UE ChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlD QSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy dC5vcmcCAxBuVTCBkwYLKoZIhvcNAQkQAgsxgYOggYAweTEQMA4GA1UEChMHUm9vdCBDQTEe MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25p bmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcCAxBuVTAN BgkqhkiG9w0BAQEFAASCAgBkeIoGK4glOHzKWubJG4iAqLPkUShmLA4rkn7ayYuJpl8G6cKQ SjVvjQDtjH7oB9VoIYtsDXPTZHi83jS9UhG/GOYAySvh8cw9PYHZWdRvWqDWKI61VkSVVmJY +8fBYZ7ORaRkVBAQwGSTQRZlMIlPJjjt7EBa2JtGLUGzxF83+Is191su7KVFAFj1OssMygzZ zEs2pF3+fFkD8LqLqRYIRK+ejSAA5TOThTh/zKYjk7/pn/UznvA74d2tY5HvT4tbfA01T58t YdTTrqfBMm3KQ2zFDf7enqBoMKe5UmX6nGv9wtme7xixcjJzhdTqiet9wNIunke6r610JcxJ 27d2JbnreqfmzdGtclm0QIGqVSlyPOQx1ajR8AHFyB+StXSMlCko6eKqKWsADNTjMou9tqNH 21hc4xGG2nxZZP5nNDo+8sX40ARCpOUzIlJoXiL/+Wqo1J2ANIxELs3hDeQKhWnw1qM0H1+l zcQTYuVNxhuLlqKM4cNNHRiCLtH9OItv5gaqGscwoqw/IUnTKslQiKV2fpABfBAvSE/kmvR7 54Ym4mq1glShVSk7R2OEnZC3u3VFbyQ3P59AqdOyVoM2DTZZp7L57HdQq5xZlKms4mwmUnaD 1gzQEZwEbOCOA4E5XxJ0ZvjxWCBl0SoAqTP0ZLq3GOlhxJdSco2R7aZUiAAAAAAAAA== --------------ms090603010503080504000002--