Reconstruct disklabel for UFS and GELI volumes

[Nikola Lečić]

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On Wed, 6 Feb 2008 21:04:23 +0100
"Ulrich Spoerlein" <uspoerlein at gmail.com> wrote:
 
> Hi,
> 
> Somehow[TM] an installation of 4.11 to ad0s3 managed to wipe out my
> existing disklabel for 7.0 on ad0s4. I now need to recover the
> disklabel to get my system to boot!
> 
> There were three labels
> - ad0s4a: UFS, exact size unknown. Is it possible to infer this from
> the UFS partition size? I can mount this already, as I simply wrote an
> 'a' label of maximum size to the disklabel
> - ad0s4b: GELI encrypted swap
> - ad0s4d: GELI encrypted ZVOL
> 
> I only need to find out the start of ad0s4d. Is the consumer size of
> an GELI device stored in the last 512 bytes metadata? Or are there
> some magic bytes in this 512 bytes so I could find out the exact end
> of ad0s4b and thus the start of ad0s4d?

Hi Ulrich,

Try to scan that disk with sysutils/testdisk:

  http://www.cgsecurity.org/wiki/TestDisk

Best regards.
- -- 
Nikola Lečić = Никола Лечић
fingerprint : FEF3 66AF C90E EDC3 D878  7CDC 956D F4AB A377 1C9B

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