{Resend with list address corrected -- ignore the duplicate, Mathias }
Hi Matthias,
On 11/09/2015 02:36 PM, Mathias Mueller wrote:
>> for x in /dev/sd[b-e]1 ; do echo $x ; dd if=$x bs=4k count=2 |hexdump
>> -C ; done
>
> /dev/sdb1
> 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
> *
> 00000400 00 20 47 07 16 10 1c 1d 67 9a 74 01 8b 5d a6 1c |. G.....g.t..]..|
> 00000410 f5 1f 47 07 00 00 00 00 02 00 00 00 02 00 00 00 |..G.............|
> 00000420 00 80 00 00 00 80 00 00 00 20 00 00 00 00 00 00 |......... ......|
> 00000430 d9 45 8b 4c 00 00 27 00 53 ef 01 00 01 00 00 00 |.E.L..'.S.......|
> 00000440 2e 44 8b 4c 00 4e ed 00 00 00 00 00 01 00 00 00 |.D.L.N..........|
> 00000450 00 00 00 00 0b 00 00 00 00 01 00 00 3c 00 00 00 |............<...|
False positive. (Not an ext4 signature).
> /dev/sdc1
> 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
> *
> 00000400 00 20 47 07 16 10 1c 1d 67 9a 74 01 8b 5d a6 1c |. G.....g.t..]..|
> 00000410 f5 1f 47 07 00 00 00 00 02 00 00 00 02 00 00 00 |..G.............|
> 00000420 00 80 00 00 00 80 00 00 00 20 00 00 00 00 00 00 |......... ......|
> 00000430 d9 45 8b 4c 00 00 27 00 53 ef 01 00 01 00 00 00 |.E.L..'.S.......|
> 00000440 2e 44 8b 4c 00 4e ed 00 00 00 00 00 01 00 00 00 |.D.L.N..........|
Also a false positive.
> /dev/sdd1
> 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
> *
> 00000400 00 20 47 07 90 0e 1c 1d 54 9a 74 01 75 aa c1 08 |. G.....T.t.u...|
> 00000410 35 47 33 07 00 00 00 00 02 00 00 00 02 00 00 00 |5G3.............|
> 00000420 00 80 00 00 00 80 00 00 00 20 00 00 0b b2 ca 4d |......... .....M|
> 00000430 7b f0 ca 4d 15 00 21 00 53 ef 01 00 01 00 00 00 |{..M..!.S.......|
> 00000440 9d 7f 3b 4d 00 4e ed 00 00 00 00 00 01 00 00 00 |..;M.N..........|
> 00000450 00 00 00 00 0b 00 00 00 00 01 00 00 3c 00 00 00 |............<...|
> 00000460 42 02 00 00 7b 00 00 00 4f a7 6a c3 f8 12 42 1c |B...{...O.j...B.|
> 00000470 8f d2 5b ec 1a e9 fb 4c 64 61 74 61 00 00 00 00 |..[....Ldata....|
> 00000480 00 00 00 00 00 00 00 00 2f 6d 65 64 69 61 2f 64 |......../media/d|
> 00000490 61 74 61 00 d8 dc 83 00 02 88 ff ff 38 da 59 4c |ata.........8.YL|
> 000004a0 00 00 00 00 00 c6 70 c3 01 88 ff ff 00 96 56 23 |......p.......V#|
> 000004b0 02 88 ff ff 40 7b 21 1d 02 88 ff ff dd 75 18 81 |....@{!......u..|
This really is an ext4 signature. Volume label 'data' last
mounted at '/media/data' on Wed, 11 May 2011 15:58:03 GMT.
Given that date and your certainty that your array was v1.2,
this must be garbage left over from a previous filesystem.
> /dev/sde1
> 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
> *
> 00000400 00 20 47 07 16 10 1c 1d 67 9a 74 01 8b 5d a6 1c |. G.....g.t..]..|
> 00000410 f5 1f 47 07 00 00 00 00 02 00 00 00 02 00 00 00 |..G.............|
> 00000420 00 80 00 00 00 80 00 00 00 20 00 00 0a 88 62 51 |......... ....bQ|
> 00000430 d5 cb 62 51 05 00 24 00 53 ef 01 00 01 00 00 00 |..bQ..$.S.......|
> 00000440 54 d4 81 50 00 4e ed 00 00 00 00 00 01 00 00 00 |T..P.N..........|
> 00000450 00 00 00 00 0b 00 00 00 00 01 00 00 3c 00 00 00 |............<...|
Another false positive.
>> Also show the following more picky signature search for each drive:
>> dd if=/dev/sdd1 bs=1M count=1M |hexdump -C |grep -E '[048c]30 .+ 53 ef'
>
> I will provide this as soon as the processes are finished, seems to take
> some more hours.
We'll just have to wait for this. Your ext4 superblock should be in
there somewhere.
> there is also one more thing I remember, maybe it's helpful: when I was
> starting the reshape, there was this message:
>
> mdadm: Need to backup 8192K of critical section..
If this was an actual error message, it may not have proceeded. We just
don't know yet.
Phil
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