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Re: two GRUB2 questions

From: Jordan Uggla
Subject: Re: two GRUB2 questions
Date: Mon, 1 Jul 2013 17:18:13 -0500

On 6/30/13, Christoph Anton Mitterer <address@hidden> wrote:
> Hi.
> I'd have two questions about grub2.
> 1) Are there checks in place that GRUB2 never accidentally installs to a
> blockdevice, which contains a filesystem or another container like an
> LVM PV, a dm-crypt LUKS container,... or a mdadm (regardless of the
> metadata-version i.e. whether it is at the beginning or not)?


> When it installs to MBR, will it always check whether the gap after the
> MBR is big enough (and only install at all (i.e. also in the 1 sector)
> when this is the case)?


> What happens if a BIOS Boot Partition on a GPT disk... will it check
> that before writing for any known fs/container (e.g. using blkid) or
> will it blindly take believe the UUID of the partition and overwrite?

grub-install will clobber whatever data happens to be in the partition
with a GPT UUID specifying it as a BIOS Boot Partition, with no checks
on the previous contents at all.

> 2) Does GRUB now officially support direct booting from mdadm RAID
> levels 5/6/50/60?


Jordan Uggla (Jordan_U on

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