[gentoo-user] best practise for 4 disks ... redundancy

["Stefan G. Weichinger" <lists@xunil.at>]

greetings again

yesterday I received a shiny new server for a client.

It brings 4 x 1 TB SATA disks, is capable of UEFI and I started setting
it up.

GPT partitioning, small partition(s) for the ESP, some swap, and bigger
partitions of type fd=raid for creating 2 mdadm-raids (rootfs and data)
with level 6.

ok so far.

Then I spent some hours fiddling with grub2, gummiboot et al to get that
box booting up fine. dracut doesn't assemble the rootfs-raid etc etc ...
-> fun

What the question is in general:

even if I manage to have it booting via UEFI from /dev/sda1 or so ... I
still have this single point of failure as the vfat-partitioned ESP is
on one physical disk only.

I would like to set it up in a way that it boots even when the /dev/sda
dies ...

Maybe I have to go the BIOS way and have an ext2-boot-raid1 over 4
disks/partitions? I did that on other servers back then.

What is the up-to-date and recommended way of achieving this?
How do you gentoo-users do these things?

I am still at the start with this server and don't mind backing up the
rootfs and start from scratch with partitioning ;)

Thanks, Stefan