On Mon, 2024-01-29 at 14:45 +0100, Franco Martelli wrote: > On 28/01/24 at 17:17, hw wrote: > > On Fri, 2024-01-26 at 16:57 +0100, Nicolas George wrote: > > > hw (12024-01-26): > > > > How do you make the BIOS read the EFI partition when it's on mdadm > > > > RAID? > > > > > > I have not yet tested but my working hypothesis is that the firmware > > > will just ignore the RAID and read the EFI partition: with the scheme I > > > described, the GPT points to the EFI partition and the EFI partition > > > just contains the data. > > > > > > Of course, it only works with RAID1, where the data on disk is the data > > > in RAID. > > > > Ok if Andy and you are right, you could reasonably boot machines with > > an UEFI BIOS when using mdadm RAID :) > > There is a sort of HOWTO [1] published in the archLinux wiki [2] but I > don't advise it because there are many things that could go wrong. > > Cheers, > > [1] https://outflux.net/blog/archives/2018/04/19/uefi-booting-and-raid1/ > [2] > https://wiki.archlinux.org/title/EFI_system_partition#ESP_on_software_RAID1
Ok in that case, hardware RAID is a requirement for machines with UEFI BIOS since otherwise their reliability is insufficient. I didn't plan on using hardware RAID for my next server, and now things are getting way more complicated than they already are because I can't just keep using the disks from my current one :( Hmm ... But I'm glad that I looked into this.
