Re: Trying to rescue a RAID-1 array

On 31/03/2022 17:44, Bruce Korb wrote:

I moved the two disks from a cleanly shut down system that could not
reboot and could not
be upgraded to a new OS release. So, I put them in.a new box and did an install.
The installation recognized them as a RAID and decided that the
partitions needed a
new superblock of type RAID-0.

That's worrying, did it really write a superblock?

Since these data have never been
remounted since the
shutdown on the original machine, I am hoping I can change the RAID
type and mount it
so as to recover my. .ssh and .thunderbird (email) directories. The
bulk of the data are
backed up (assuming no issues with the full backup of my critical
data), but rebuilding
and redistributing the .ssh directory would be a particular nuisance.

SO: what are my options? I can't find any advice on how to tell mdadm
that the RAID-0 partitions
really are RAID-1 partitions. Last gasp might be to "mdadm --create"
the RAID-1 again, but there's
a lot of advice out there saying that it really is the last gasp
before giving up. :)

https://raid.wiki.kernel.org/index.php/Asking_for_help

Especially lsdrv. That tells us a LOT about your system.

What was the filesystem on your raid? Hopefully it's as simple as moving 
the "start of partition", breaking the raid completely, and you can just 
mount the filesystem.

What really worries me is how and why it both recognised it as a raid, 
then thought it needed to be converted to raid-0. That just sounds wrong 
on so many levels. Did you let it mess with your superblocks? I hope you 
said "don't touch those drives"?

Cheers,
Wol