Re: Accidentally resized array to 9

[Roman Mamedov <rm@romanrm.net>]

On Sat, 30 Sep 2017 12:21:20 -0400
Phil Turmel <philip@turmel.org> wrote:

> > Ideally what you can hope for, is you would get the bulk of array data intact,
> > only with the first 9 KB of each device *(8-2), so about the first 54 KB of
> > data on the md array, corrupted and unusable. It is likely the LVM and
> > filesystem tools will not recognize anything due to that, so you will need to
> > use some data recovery software to look for and save the data.
> > 
> 
> I agree with Roman.  Most of your array should be still on the 8-disk
> layout.  But you were mounted and had writing processes immediately
> after the broken grow, so there's probably other corruption due to
> writes on the 9-disk pattern in the 8 disks.

Adding one afterthought that I had, you could probably salvage the 54 KB in
question by reading them in (and saving to a file) from the current
"9-device array of 9KB devices" that you got.

With respect,
Roman