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[87.175.174.170]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4310ada818dsm3293204f8f.8.2025.12.16.23.25.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Dec 2025 23:25:24 -0800 (PST) Message-ID: <2d9aa651-93b6-407c-b7a1-092e454134bf@gmail.com> Date: Wed, 17 Dec 2025 08:25:24 +0100 Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Issues with md raid 1 on kernel 6.18 after booting kernel 6.19rc1 once To: yukuai@fnnas.com, linux-raid@vger.kernel.org, linan122@huawei.com, xni@redhat.com References: <8fd97a33-eb5a-4c88-ac8a-bfa1dd2ced61@fnnas.com> <619a9b00-43dd-4897-8bb0-9ff29a760f52@gmail.com> Content-Language: en-US From: BugReports In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi, many thx for the clarification cause that makes a huge diff ! Br Am 17.12.25 um 08:17 schrieb Yu Kuai: > Hi, > > 在 2025/12/17 15:13, BugReports 写道: >> ... >> >> We'll have to backport following patch into old kernels to make new >> arrays to assemble in old >> kernels. >> >> .... >> >> >> The md array which i am talking about was not created with kernel >> 6.19, it was created sometime in 2024. >> >> It was just used in kernel 6.19 and that broke compatibility with my >> 6.18 kernel. > I know, I mean any array that is created or assembled in new kernels will now have > lsb field stored in metadata. This field is not defined in old kernels and that's why > array can't assembled in old kernels, due to unknown metadata. > > This is what we have to do for new features, and we're planning to avoid the forward > compatibility issue with the above patch that I mentioned. >