So, is this md raid1, or true hardware RAID-1? If it's md raid1:
MBR system - boot block should be installed to both drives, remainder is installed to the /boot filesystem (or / if there's no /boot filesystem) GPT - I'm not 100% sure (haven't looked into the details), but in that case, I think GRUB mostly installs to the /efi filesystem, and possibly also /boot filesystem (or / if there's no /boot filesystem), similar to the above. As for /efi, that can't be under md raid1, however one can have it on two drives and install it to both for redundancy. If the RAID-1 is true hardware RAID-1, it would be installed as noted above, and there's no two separate copies of any of the relevant filesystems, at least for most intents and purposes as far as the Operating System (OS) and GRUB, etc. are able to see, but it otherwise is installed as noted above. Generally the installation process walks you through the GRUB installation, it generally will prompt you for the device(s) to install on. In the case of true hardware RAID-1, one would generally just select the one device corresponding to the hardware RAID-1 device (e.g. generally entire disks done as RAID-1 by hardware, and target that device as seen by the OS. RAID-1 other than true hardware RAID-1 or md raid1 may not be (fully) supported, most notably for boot and GRUB installation. On Tue, Apr 22, 2025 at 3:27 PM Pier Antonio Corradini <pierantonio.corrad...@gmail.com> wrote: > > Hello everyone, > > Debian 12 does not install GRUB on a RAID 1 array of my computer: I don't > know if this problem is caused by a hardware failure or by my inexperience so > I ask if there is a reference guide for this case. Thanks. > > > C.P.A.
