documentation of GEOM data structures needed
Warren Block
wblock at wonkity.com
Mon Nov 11 15:20:02 UTC 2013
On Mon, 11 Nov 2013, Erich Dollansky wrote:
> I would need a documentation of the GEOM data structure. A disk got
> damages in a strange way during the process of backing up data. It was
> partitioned with gpart as all my disks using the MBR schema. When
> creating the backup, the system crashed. The disk was not usable
> anymore. I found out that the MBR was overwritten before the backup was
> started while the beginning of the first partition seems to be ok.
MBR does not have any specific GEOM structure. It's just a standard
MBR: http://en.wikipedia.org/wiki/Master_boot_record
See the end of the mdconfig(8) man page for an example of using it and
gnop(8) to skip over an arbitrary length of data at the start of a disk.
With that and file -s, you can attempt to find mountable filesystems on
the whole disk. A script would be the fastest way. The first one
should be relatively easy. After that, guessing approximate locations
would speed it up a lot.
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