From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phil Turmel Subject: Re: Brocken Raid & LUKS Date: Thu, 21 Feb 2013 13:54:43 -0500 Message-ID: <51266D73.5020700@turmel.org> References: <5123A1CC.2000003@heisl.org> <5123BD1F.4060200@turmel.org> <5123E4E9.3020609@heisl.org> <5123EB92.5090505@turmel.org> <5123EF45.6080405@heisl.org> <5123F7C7.7000406@turmel.org> <5123FB71.3060509@heisl.org> <5124196F.6090000@turmel.org> <512516C2.3010105@heisl.org> <5125184A.6040707@turmel.org> <5125C6E9.4050802@heisl.org> <5125EBFD.3050802@heisl.org> <51262137.3040609@turmel.org> <51262CE0.3000809@heisl.org> <51263785.2010001@turmel.org> <51263D9D.1080002@heisl.org> <51263F7E.7040207@turmel.org> <5126421E.3040702@turmel.org> <51264C18.8000201@heisl.org> <51264E26.9050100@turmel.org> <51264EBF.9090000@heisl.org> <51264F7F.3020508@turmel.org> <512650A1.7070103@heisl.org> <51265132.7070706@turmel.org> <512656B5.4090505@heisl.org> <51265824.4030407@heisl.org> <51265B0B.9020108@turm el.org> <51265DA7.2030209@heisl.org> <512660B9.8090609@turmel.org> <5126629A.1090002@heisl.org> <51266360.9030402@turmel.org> <5126678D.9030101@heisl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5126678D.9030101@heisl.org> Sender: linux-raid-owner@vger.kernel.org To: Stone Cc: linux-raid List-Id: linux-raid.ids On 02/21/2013 01:29 PM, Stone wrote: > Am 21.02.2013 19:11, schrieb Phil Turmel: >> On 02/21/2013 01:08 PM, Stone wrote: >> >>> ok i have checked all superblocks but i get always the same message. >>> here one sample: >>> fsck.ext4 -n -b 644972544 /dev/mapper/md2_nas >>> e2fsck 1.41.14 (22-Dec-2010) >>> fsck.ext4: Invalid argument while trying to open /dev/mapper/md2_nas >>> >>> The superblock could not be read or does not describe a correct ext2 >>> filesystem. If the device is valid and it really contains an ext2 >>> filesystem (and not swap or ufs or something else), then the superblock >>> is corrupt, and you might try running e2fsck with an alternate >>> superblock: >>> e2fsck -b 8193 >> You very likely have the wrong chunk size. >> >> Close luks, stop md2, and re-create with --chunk=64 >> >> And then try to fsck again. (Without -b at first.) >> >> Phil > ok. with --chunk=64 i cannot open the luks. > in witch steps (chunk) should i continue? That is a big surprise. The luks signature should not move with chunk size. Please use "mdadm -E /dev/sdc1" to recheck your data offset. If that wasn't it, please show the hexdump for the entire luks signature. I'd like to see its payload offset. Also, if you go back to --chunk=512, open the luks, you could run the following command to find possible superblock locations: hexdump -C /dev/mapper/md2_nas |egrep '^[0-9a-f]+30 .+ 53 ef' >sb.lst (May take a long time to read the whole array) Phil