2017-04-24 4:09 GMT+02:00, Brad Campbell [off-list ref]:

On 24/04/17 03:21, Patrik Dahlström wrote:

quoted

I just thought of something: since /dev/sdf is a completely new disk,
shouldn't I be able to locate the starting point by looking at how much
of the new disk is filled. It comes filled with zeros from factory,
right?

Pretty close. You should also be able to see how the reshape worked
(front to back, back to front) and you should get a pretty good idea of
the data-offset by the gap between the superblock and the data.

I've let a program compare both raid sets (5 and 6 disk) overnight. So
far it has gone from 128 MB to 14 TB without finding common data. Does
that tell us anything?
Should I pause the comparison and look at the end of sdf to find the
last written offset? I currently only have 1 shell in Ubuntu
maintenance/rescue mode

I must say I'm having trouble imagining a more difficult recovery
scenario, so at least you present an interesting challenge.

I always like a challenge, but this one I believe I could've skipped :)

There's a lot to be said for the old "Don't panic" mantra, but hindsight
is always 20/20.

All too true

Best regards
// Patrik