From mboxrd@z Thu Jan 1 00:00:00 1970 From: Francis Moreau Subject: Re: Soft RAID and EFI systems Date: Tue, 04 Feb 2014 09:22:13 +0100 Message-ID: <52F0A335.4020700@gmail.com> References: <52EF67DB.9030403@hesbynett.no> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <52EF67DB.9030403@hesbynett.no> Sender: linux-raid-owner@vger.kernel.org To: David Brown , linux-raid List-Id: linux-raid.ids On 02/03/2014 10:56 AM, David Brown wrote: > On 31/01/14 18:02, Francis Moreau wrote: >> Hello, >> >> On EFI systems I'd like to RAID mirror /boot partition. >> >> For HW RAID there's no issue since access to the disk or any >> partitions should be totally transparent to the bios. >> >> For Fake RAID, I'm not sure but I would say that the bios is able to >> read the RAID metadata as well. >> >> For (md) Soft RAID, I don't know. I would say that the bios is >> unlikely to understand the md metadata stored in the /boot partition >> so it won't work. >> Is that correct ? >> If so does that mean I can't mirror /boot partition on EFI systems ? >> Maybe creating a RAID device using the whole disk (not the partition >> device) would work ? >> >> Thanks for your enlightments. >> > > I can't answer your question as such, but in case you don't know > VirtualBox virtual machines can be configured with an EFI instead of a > normal bios. I don't know how complete the emulation of EFI is, but > that might give you a quick and easy way to test out the different ideas. > Yes but I'll give some testing on qemu first, it seems that it's possible to find and use a EFI bios for qemu. thanks.