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Re: Building a disk

From: Jordan Uggla
Subject: Re: Building a disk
Date: Wed, 11 Apr 2012 13:39:31 -0700

On Wed, Apr 11, 2012 at 5:25 AM, Dale Amon <address@hidden> wrote:
> On Tue, Apr 10, 2012 at 09:28:23PM -0700, Jordan Uggla wrote:
>> Grub legacy is not supported here (it hasn't had an upstream for over
>> six years). If you want support for grub legacy you might try asking
>> in the support channels for the distribution who you are getting grub
>> legacy from.
> I have servers to maintain that have been running
> for years and are mission critical so they still
> use grub 1. I have to have a failsafe procedure for
> getting them back on line exactly as they were
> in the absolute minimum possible time, which means
> they have to come back exactly as they were, grub 1
> and all.

And for that you'll still need to get support from another venue.

> May I need to store a copy of sector 0 or perhaps
> more. I looked at sectors 0-63 of a sample machine
> and there appears to be data in all but sector 63.
> Is grub using this?

Yes. On BIOS systems with an msdos partition table the pos-mbr gap is
used as an area to embed grub's core.img. This core.img, along with
additional blocks for error correction, will be stored in the pos-mbr
gap and could use more than 63 sectors if the core.img needs to be
larger, for instance when /boot/ is contained on LVM. It is highly
recommended that you use grub-install to install or re-install grub.

Jordan Uggla (Jordan_U on

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