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Re: Switching to another boot device on failure

From: Andrei Borzenkov
Subject: Re: Switching to another boot device on failure
Date: Wed, 19 Nov 2014 06:16:54 +0300

В Tue, 18 Nov 2014 10:51:00 +0000 (UTC)
Venkata Subbarao <address@hidden> пишет:

> Hi All,
> I am working on a task on XUbuntu OS in which due to any reason if booting
> fails I would like to switch to another boot device by zeroing the MBR of
> current boot disk. Is this possible ?
> For example instead of showing following prompt, I would like to zero out
> the MBR so that the BIOS can select next boot device upon reset.
> error: no such partition
> grub rescue>

grub supports only very limited and controlled ways to write to
device/file. Doing something like this in unattended manner is probably
way too dangerous.

What would be possible is to optionally exit grub (after timeout) in
this case; then BIOS should proceed to next boot device.

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