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Wed, 4 Sep 2019 06:08:42 +0000 From: Jorge Fernandez Monteagudo To: Qu Wenruo , "linux-btrfs@vger.kernel.org" Subject: RE: btrfs and checksum Thread-Topic: btrfs and checksum Thread-Index: AQHVYuV0Bwq6n8twVEGqFBAVEg/N3w== Date: Wed, 4 Sep 2019 06:08:42 +0000 Message-ID: Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=jorgefm@cirsa.com; x-originating-ip: [185.180.48.110] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: dee47e03-42d3-4d23-30ae-08d730fe5680 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600166)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:AM6PR10MB2327; x-ms-traffictypediagnostic: AM6PR10MB2327: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; x-forefront-prvs: 0150F3F97D x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(136003)(376002)(346002)(366004)(396003)(39860400002)(199004)(189003)(54014002)(2501003)(52536014)(2906002)(66066001)(33656002)(476003)(478600001)(486006)(14454004)(26005)(7696005)(99286004)(86362001)(186003)(102836004)(110136005)(6506007)(316002)(3480700005)(25786009)(55016002)(6246003)(66946007)(76116006)(7736002)(305945005)(66476007)(66556008)(64756008)(66446008)(74316002)(81156014)(6436002)(71190400001)(71200400001)(256004)(14444005)(81166006)(8936002)(5660300002)(3846002)(53936002)(7116003)(9686003)(229853002)(8676002)(6116002);DIR:OUT;SFP:1102;SCL:1;SRVR:AM6PR10MB2327;H:AM6PR10MB3399.EURPRD10.PROD.OUTLOOK.COM;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: cirsa.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: WVoYdQWuoL73hQBwIIIeTMLW6GKqwAN/DrPlzXdtoku4hiT5MYapIzUTtFQJ3yfDueoCJRdMucrTQHiFrtp9dlClKesBJtmSmSVBr9Er6JS3XKGWUuJwOsAJ9fzuvILrAniDjdqxF4xh0uA1qhNc9pwmHJPWqWEhIkOXj+6vMrKQzrDkEYpAzoxxeDalTiySwJW2D/Ij6nhdYnuQQ9lWD+gkfDZ8n/LoDZ9MGHFh9P2tbncMi9bpkSJkuA7fhPjzGXBD3bTU1BfNFqBPsCRaVxnLAjEfS+RhZDJEXcp6WCApK06vH9PzIVA49U8jewOeN4FbORV6ZCGrzAKuXa8lEAvqF7mHYSjATADMqsWW0s498ug/tPLVSwc2Hxb4xX5bgUp6lw9UkzUu0QeJy6GiUq2M/wduJlmbP/Y/xy+mqQA= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: cirsa.com X-MS-Exchange-CrossTenant-Network-Message-Id: dee47e03-42d3-4d23-30ae-08d730fe5680 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Sep 2019 06:08:42.5553 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: e6d255d9-7bfe-42f2-a01e-09634cc3a03b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: HqzSImtqeuz6rMumXJBMLdvcmJXoVD4WQncjHFGRseDigMGgUygP5szx/qTeodkDJj87qgReqQJOkY3ho0FFyA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR10MB2327 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Hi Qu, thanks for answering!=0A= =0A= >RO of the ext4, and still get corruption? Definitely looks like a=0A= >hardware problem to me.=0A= =0A= It's a weird error, because rebooting the machine the previous error disape= ars and the file could be read ok, then we know that the info in disk is ok= . Then, the suspects list grows up: disk, RAM memory, kernel error (block l= ayer?, filesystem layer?).... It's not a frequent bug so it's difficult to = debug it.=0A= =0A= =0A= >For btrfs, as long as you're using data csum (default), btrfs can detect= =0A= >such corruption.=0A= >=0A= >For v5.2 kernel, btrfs can even detects some easy to expose memory=0A= >corruption.=0A= >=0A= >But please keep in mind that, due to the fact btrfs (at least least=0A= >version) is very picky about corrupted on-disk data or memory, if you=0A= >find something wrong, you need to check dmesg to see what's going wrong.= =0A= >=0A= >Furthermore, if your ssd is not reliable, especially when it lies about=0A= >FLUSH/FUA, btrfs can be easier to be corrupted, as btrfs completely=0A= >relies on FLUSH/FUA and metadata COW to ensure its safety against=0A= >powerloss, it's way easier to get corrupted if FLUSH/FUA is not=0A= >implemented corrected.=0A= >=0A= >(On the other hand, btrfs is more robust against data corruption, so as=0A= >long as your SSD is OK, you may find a better experience using btrfs)=0A= =0A= Then, it's advised to change the ext4 to btrfs or it's better to change the= ISO packages filesytem to btrfs?=0A= =0A= Thanks!=0A= Jorge=