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Thu, 25 Jan 2024 11:49:33 +0000 Date: Thu, 25 Jan 2024 11:49:27 +0000 (UTC) From: RJ Marquette To: "linux-raid@vger.kernel.org" Message-ID: <1822211334.391999.1706183367969@mail.yahoo.com> In-Reply-To: References: <432300551.863689.1705953121879.ref@mail.yahoo.com> <432300551.863689.1705953121879@mail.yahoo.com> <04757cef-9edf-449a-93ab-a0534a821dc6@thelounge.net> <1085291040.906901.1705961588972@mail.yahoo.com> <0f28b23e-54f2-49ed-9149-87dbe3cffb30@thelounge.net> <598555968.936049.1705968542252@mail.yahoo.com> <755754794.951974.1705974751281@mail.yahoo.com> <20240123110624.1b625180@firefly> <12445908.1094378.1706026572835@mail.yahoo.com> <20240123221935.683eb1eb@firefly> <1979173383.106122.1706098632056@mail.yahoo.com> <006fe0ca-a2fb-4ccd-b4d4-c01945d72661@penguinpee.nl> <2058198167.201827.1706119581305@mail.yahoo.com> <544664840.269616.1706131905741@mail.yahoo.com> <5112393.323817.1706145196938@mail.yahoo.com> Subject: Re: Requesting help recovering my array Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Mailer: WebService/1.1.22046 YMailNorrin root@jackie:/home/rj# /sbin/fdisk -l /dev/sdb Disk /dev/sdb: 2.73 TiB, 3000592982016 bytes, 5860533168 sectors Disk model: Hitachi HUS72403 Units: sectors of 1 * 512 =3D 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disklabel type: gpt Disk identifier: AF5DC5DE-1404-4F4F-85AF-B5574CD9C627 Device =C2=A0=C2=A0=C2=A0=C2=A0Start =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0End =C2=A0=C2=A0=C2=A0Sectors =C2=A0Size Type /dev/sdb1 =C2=A0=C2=A02048 5860532223 5860530176 =C2=A02.7T Microsoft basic= data root@jackie:/home/rj# cat /sys/block/sdb/sdb1/start =C2=A0 2048 root@jackie:/home/rj# cat /sys/block/sdb/sdb1/size 5860530176 (I haven't checked all of the drives in the array, just this one.) Thanks. --RJ On Thursday, January 25, 2024 at 06:07:27 AM EST, Pascal Hambourg wrote:=20 On 25/01/2024 at 02:57, Roger Heflin wrote: >=20 > dd if=3D/dev/zero of=3D/dev/sdb bs=3D512 count=3D1=C2=A0 =C2=A0 (for each= disk). I'm afraid it won't help. As far as I can see, having an MBR signature in the first sector does=20 not prevent blkid or mdadm from detecting the RAID superblock. Also, previous mail from the OP show that the disks have GPT partition=20 tables (as expected with 3 TiB) which usually span (~16 KiB) beyond the=20 beginning of the 1.2 RAID superblock (4 KiB) so I suspect that the RAID=20 superblock was overwritten. A tiny hope is that the RAID member was actually in a partition but the=20 geometry in the partition table is wrong or the kernel does not read it=20 properly (I have seen this once). You can check the partition table and=20 how the kernel sees the partition with fdisk -l /dev/sdb cat /sys/block/sdb/sdb1/start cat /sys/block/sdb/sdb1/size > On Wed, Jan 24, 2024 at 7:13=C3=A2=E2=82=AC=C2=AFPM RJ Marquette wrote: >> >> It looks like this is what happened after all.=C2=A0 I searched for "MBR= Magic aa55" and found someone else with the same issue long ago:=C2=A0 htt= ps://serverfault.com/questions/580761/is-mdadm-raid-toast=C2=A0 Looks like = his was caused by a RAID configuration option in BIOS.=C2=A0 I recall seein= g that on mine; I must have activated it by accident when setting the boot = drive or something. >> >> I swapped the old motherboard back in, no improvement, so I'm back to th= e new one.=C2=A0 I'm now running testdisk to see if I can repair the partit= ion table.