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Thu, 24 Oct 2024 08:57:31 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088%5]) with mapi id 15.20.8093.018; Thu, 24 Oct 2024 08:57:31 +0000 Message-ID: <3654e52e-d51e-4a61-aead-789e745599bf@oracle.com> Date: Thu, 24 Oct 2024 09:57:27 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 5/6] md/raid1: Handle bio_split() errors To: Yu Kuai , Geoff Back , axboe@kernel.dk, hch@lst.de Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, martin.petersen@oracle.com, "yangerkun@huawei.com" , "yukuai (C)" References: <20240919092302.3094725-1-john.g.garry@oracle.com> <20240919092302.3094725-6-john.g.garry@oracle.com> <0161641d-daef-4804-b4d2-4a83f625bc77@oracle.com> <44806c6f-d96a-498c-83e1-e3853ee79d5a@oracle.com> <59a46919-6c6d-46cb-1fe4-5ded849617e1@huaweicloud.com> <6148a744-e62c-45f6-b273-772aaf51a2df@oracle.com> <0cf7985e-e7ac-4503-827b-eb2a0fd6ef67@oracle.com> <098e65e7-53fb-4bf1-b973-2bda425139ae@demonlair.co.uk> <5a16f8c2-d868-48cf-96c8-a0d99e440ca5@oracle.com> Content-Language: en-US From: John Garry Organization: Oracle Corporation In-Reply-To: Content-Type: text/plain; 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If you want to enable atomic >>>>> write >>>>> for raid1/raid10, you must add a new branch to handle badblocks now, >>>>> otherwise, as long as one copy contain any badblocks, atomic write >>>>> will >>>>> fail while theoretically I think it can work. >>>> Can you please expand on what you mean by this last sentence, "I think >>>> it can work". > > I mean in this case, for the write IO, there is no need to split this IO > for the underlying disks that doesn't have BB, hence atomic write can > still work. Currently solution is to split the IO to the range that all > underlying disks doesn't have BB. ok, right. > >>>> >>>> Indeed, IMO, chance of encountering a device with BBs and supporting >>>> atomic writes is low, so no need to try to make it work (if it were >>>> possible) - I think that we just report EIO. > > If you want this, then make sure raid will set fail fast together with > atomic write. This way disk will just faulty with IO error instead of > marking with BB, hence make sure there are no BBs. To be clear, you mean to set the r1/r10 bio failfast flag, right? There are rdev and also r1/r10 bio failfast flags. Thanks, John