Considering this situation I which I'm 100% sure that the Reshape
procedure altered some RAID metadata/headers, without having started to
really reshape the content (no activity, reshape procedure was stuck at
0% and doesn't even want to continue after the reboot).
Considering previous printout :
Apr 30 02:48:37 Pix-Server-Sorel kernel: [47934.106025] --- level:5
rd:3 wd:3
Apr 30 02:48:37 Pix-Server-Sorel kernel: [47934.106028] disk 0, o:1,
dev:sdd1
Apr 30 02:48:37 Pix-Server-Sorel kernel: [47934.106029] disk 1, o:1,
dev:sde1
Apr 30 02:48:37 Pix-Server-Sorel kernel: [47934.106031] disk 2, o:1,
dev:sdb1
Considering the fantastic answer of Shane Madden here :
https://serverfault.com/questions/347606/recover-raid-5-data-after-created-new-array-instead-of-re-using
I'm about to play the following command :
mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sdd1 /dev/sde1
/dev/sdb1 --assume-clean
Is it fine ?