From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f177.google.com ([209.85.213.177]:37613 "EHLO mail-ig0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933440AbbGVLQb (ORCPT ); Wed, 22 Jul 2015 07:16:31 -0400 Received: by igbpg9 with SMTP id pg9so130310973igb.0 for ; Wed, 22 Jul 2015 04:16:31 -0700 (PDT) Subject: Re: Can't mount btrfs volume on rbd To: Qu Wenruo , Steve Dainard References: <557A890D.8080306@cn.fujitsu.com> <557E877E.2060704@cn.fujitsu.com> <557F7B82.2060203@cn.fujitsu.com> <55A46473.8070106@cn.fujitsu.com> <55AE04EF.6040807@cn.fujitsu.com> <55AE29DA.4050201@gmail.com> <55AEF984.9080706@cn.fujitsu.com> Cc: linux-btrfs@vger.kernel.org From: Austin S Hemmelgarn Message-ID: <55AF7B84.9000009@gmail.com> Date: Wed, 22 Jul 2015 07:16:20 -0400 MIME-Version: 1.0 In-Reply-To: <55AEF984.9080706@cn.fujitsu.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms020104050500060902000307" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms020104050500060902000307 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-07-21 22:01, Qu Wenruo wrote: > Steve Dainard wrote on 2015/07/21 14:07 -0700: >> I don't know if this has any bearing on the failure case, but the >> filesystem that I sent an image of was only ever created, subvol >> created, and mounted/unmounted several times. There was never any data= >> written to that mount point. >> > Subvol creation and rw mount is enough to trigger 2~3 transaction with > DATA written into btrfs. > As the first rw mount will create free space cache, which is counted as= > data. > > But without multiple mount instants, I really can't consider another > method to destroy btrfs so badly but with all csum OK... > I know that a while back RBD had some intermittent issues with data=20 corruption in the default configuration when the network isn't=20 absolutely 100% reliable between all nodes (which for ceph means not=20 only no packet loss, but also tight time synchronization between nodes=20 and only very low network latency). I also heard somewhere (can't remember exactly where though) of people=20 having issues with ZFS on top of RBD. The other thing to keep in mind is that Ceph does automatic background=20 data scrubbing (including rewriting stuff it thinks is corrupted), so=20 there is no guarantee that the data on the block device won't change=20 suddenly without the FS on it doing anything. --------------ms020104050500060902000307 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 hvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTUwNzIyMTExNjIwWjBPBgkq hkiG9w0BCQQxQgRAd62+uZB5PGvotqeRWObdBWRnsPRQs2dpEdMduEK4eDY4QpzvtDAVnnP4 PCcd5VeEX49c7giLw7FFa50FZvxuXDBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIGRBgkrBgEEAYI3EAQxgYMwgYAweTEQMA4GA1UE ChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlD QSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy dC5vcmcCAxBuVTCBkwYLKoZIhvcNAQkQAgsxgYOggYAweTEQMA4GA1UEChMHUm9vdCBDQTEe MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25p bmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcCAxBuVTAN BgkqhkiG9w0BAQEFAASCAgAOSrTzd/oq64ZN65CYDE2isV1zTmuvK4EwX+5FshfTiJuJbGGl zABXAed3wIZXhq/4Gb93HJT0GuqSdszE5AoBmQVFqezA7E8c3L3kMbBzo/fsPV2v6F+L/fVc aiFpFQhGRLo6DngOonJxKfODbwJfQ9tNWmhxtTmWLOrVmJZllJilZopBet7Cpj2I9eZucmbZ E7RXQEN76N3At+N+Bzh1pMlNQoOVJP+QshzTSz3luuBtR10a6L6ivvW939zWYaWijUeLouFu YwgUsMghud/yg4q/CkZtTvqLr67IAr6CaW0P9GLMAv14bm7C+VQyn4x+2Mvg7wuUunrAA/4+ xqbgpSRdUP8LpaXM09el8IDfnCTf8pAa7Ke1WfFb+soP3V0kCSlos1mEPe5TvCZcJ08wDv3z Ap9FRE3nP5BxPGjBQU4NmZbdJqi4AsrhZ3pIeK+SKXCmSzYq5awoFyv+aeYl1wr9dYmsqj4w HOk44xlPN3i0x5rpQ3FO5qsOkS4YUdHdjH6DzVmbd5qBPzzASk7b0lJra5KtuCyC4G2w2/BV DAK6VksAnjvQaVOA68Y3Q9LiE2B8OzKjzbkWuisTm8SLgSkEgJ/25feJaJBAzKNs45YSqxPe 41waXsxmkQxPzx17AS/hFmtBBynaUSVSWcElSMA767+6BF683roK8YSWKgAAAAAAAA== --------------ms020104050500060902000307--