Lenny (5.0) and later support having the root and /boot partition on RAID volume. Actually, you can have root on RAID1+LVM partition.

This page contains some screenshots to demonstrate it, and applies to Debian 5.0 through, at least, 8.0, and probably 11.0.

Root on software RAID+LVM

In this example, we use virtual machine (qemu or kvm)... we can play, and break them ;-)

Of course, you need to download a cdrom image.

Root on RAID+LVM example

Those few screenshots show how to install root on lvm on raid :

Once you have reach DebianInstaller partitioning screen...

Choose manual partitioning, then on each disk, manually create a partition (same size on both disks).

Create partitions for RAID

Configure RAID

Configure LVM

Use the LVM volumes

Install the bootloader (GRUB)

In Jessie (8.0), and I believe Wheezy (7.0), the installer will install GRUB even on RAID installs. However, GRUB can not install to a RAID device (e.g., /dev/md0), but will nonetheless work fine.

When you install in UEFI mode, refer to RAID for the EFI System Partition as the following steps only work for BIOS mode.

Reboot Debian

See also

CategoryDebianInstaller | CategoryRoot | CategoryHardware | CategorySystemAdministration | CategoryRedundant: merge with other ?CategoryRaid pages