De acordo com a equipe da Redhat :
Grub doesn't support LVM RAID1 (it supports only RAID 4/5/6 type IIRC).
O Debian 8 tem algum interior antigo, você pode ter a mesma limitação, eu queria encontrar alguma informação oficial sobre as limitações do Grub, infelizmente eu falhei.
Re: [linux-lvm] GRUB boot problem with lvm mirror type raid1 From: Peter Rajnoha <prajnoha redhat com> To: gk180984 interia pl Cc: LVM general discussion and development <linux-lvm redhat com> Subject: Re: [linux-lvm] GRUB boot problem with lvm mirror type raid1 Date: Mon, 14 Apr 2014 11:40:36 +0200
On 04/14/2014 10:42 AM, gk180984 interia pl wrote: Hi I want to ask it is possible boot root file system (via GRUB) from LVM RAID1 volume? I can boot root file system (with /boot) from linera LVM volume and from mirror volume, but when I create raid1 mirror GRUB can't boot from it: lvconvert --type raid1 -m1 gsys/vsys LVM mirror is work: lvconvert -m1 gsys/vsys I have two disk and use only LVM, not other raid software. GRUB have lvm module.
Grub doesn't support LVM RAID1 (it supports only RAID 4/5/6 type IIRC). However, I don't recommend using /boot on LVM at the moment since grub support for LVM is limited and unofficial. There's a plan to add official and more robust support though - there are ongoing discussions between grub and LVM team...