[dm-crypt] /dev/md1 is not a valid LUKS device

Arno Wagner arno at wagner.name
Wed Jul 6 11:44:59 CEST 2011


At least th eheader was not just overwritten and looks intact. 
I have no idea why you get this error message.

Arno

On Wed, Jul 06, 2011 at 10:53:09AM +0200, Louis-David Mitterrand wrote:
> Hi Arno,
> 
> I am resending this answer to the list, as I am not sure you got it.
> From the hexdump can you just tell me whether it is likely or not that I
> can recover my partition?
> 
> Thanks,
> 
> On Mon, Jul 04, 2011 at 11:10:24PM +0200, Arno Wagner wrote:
> > On Mon, Jul 04, 2011 at 05:45:23PM +0200, Louis-David Mitterrand wrote:
> > > Hi,
> > > 
> > > After a hardware crash I now get this error:
> > > 
> > > 	root at grml ~ # cryptsetup isLuks /dev/md1 
> > > 	Device /dev/md1 is not a valid LUKS device
> > > 
> > > Am I basically fucked?
> > 
> > I assume you have no header backup? 
> 
> Alas no.
> 
> > If so, possibly, but not necessarily. Is this on an SSD? There
> 
> No SSD, md raid6 array on regular disks.
> 
> > the LUKS header could be in the same "sector" as a data area 
> > (due large SSD actual sector size)
> > 
> > Can you send me the first 700 bytes of the partition as hexdump?
> > You can get them for example like this:
> > 
> >   hd /dev/md1 | head -n 40
> 
> 00000000  4c 55 4b 53 ba be 00 01  61 65 73 00 00 00 00 00  |LUKS??..aes.....|
> 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000020  00 00 00 00 00 00 00 00  63 62 63 2d 65 73 73 69  |........cbc-essi|
> 00000030  76 3a 73 68 61 32 35 36  00 00 00 00 00 00 00 00  |v:sha256........|
> 00000040  00 00 00 00 00 00 00 00  73 68 61 31 00 00 00 00  |........sha1....|
> 00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000060  00 00 00 00 00 00 00 00  00 00 18 00 00 00 00 20  |............... |
> 00000070  08 61 ee d5 da 46 75 45  3a 26 b7 68 ee 3a 4c 65  |.a???FuE:&?h?:Le|
> 00000080  ce 97 79 5f 5e 5c 96 00  a3 e1 11 f2 83 74 e9 a6  |?.y_^\..??.?.t??|
> 00000090  97 d1 fe 67 0b 30 0e f0  24 cb 7c 27 4e d1 57 a8  |.??g.0.?$?|'N?W?|
> 000000a0  3e bc 9a d4 00 00 a6 81  32 39 63 61 32 63 31 32  |>?.?..?.29ca2c12|
> 000000b0  2d 64 64 32 62 2d 34 33  61 66 2d 61 33 33 30 2d  |-dd2b-43af-a330-|
> 000000c0  32 34 30 39 33 64 63 38  65 34 65 31 00 00 00 00  |24093dc8e4e1....|
> 000000d0  00 ac 71 f3 00 02 9a 2d  e3 83 7c e6 f6 a2 10 ad  |.?q?...-?.|???.?|
> 000000e0  53 72 23 25 82 22 80 8d  af 3b ea c8 0d 85 7a 18  |Sr#%."..?;??..z.|
> 000000f0  5e 59 b0 92 b6 ca 5d e6  00 00 00 08 00 00 0f a0  |^Y?.??]?.......?|
> 00000100  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> 00000110  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000120  00 00 00 00 00 00 00 00  00 00 01 08 00 00 0f a0  |...............?|
> 00000130  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> 00000140  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000150  00 00 00 00 00 00 00 00  00 00 02 08 00 00 0f a0  |...............?|
> 00000160  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> 00000170  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000180  00 00 00 00 00 00 00 00  00 00 03 08 00 00 0f a0  |...............?|
> 00000190  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> 000001a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 000001b0  00 00 00 00 00 00 00 00  00 00 04 08 00 00 0f a0  |...............?|
> 000001c0  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> 000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 000001e0  00 00 00 00 00 00 00 00  00 00 05 08 00 00 0f a0  |...............?|
> 000001f0  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> 00000200  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000210  00 00 00 00 00 00 00 00  00 00 06 08 00 00 0f a0  |...............?|
> 00000220  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00  |..??............|
> 00000230  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000240  00 00 00 00 00 00 00 00  00 00 07 08 00 00 0f a0  |...............?|
> 00000250  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> *
> 00001000  2d 51 43 53 eb 1b 55 ac  05 9a b1 5f 57 33 31 11  |-QCS?.U?..?_W31.|
> 
> 
> Thanks,
> 

-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
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