Le 25/06/2022 à 00:08, Roman Mamedov a écrit :

Using RAID1 across all disks with metadata 0.90 for /boot makes sure the BIOS
can boot no matter which disk it tries first.

Why 0.90 ? It is obsolete. If you need RAID metadata at the end of RAID 
members for whatever ugly reason, you can use metadata 1.0 instead. But 
AFAIK it is only needed as a dirty hack with boot loaders which do not 
really support software RAID and must see RAID partitions as native 
filesystems.

In fact it could be with recent grub the "0.90" part is not even required
anymore.

GRUB has supported RAID metadata 1.x since version 1.99 (2010).