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Re: Grub on Partitionless Full Disk LVM

From: Jack Waterworth
Subject: Re: Grub on Partitionless Full Disk LVM
Date: Mon, 30 Mar 2015 09:28:47 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

I believe the lvm module for grub is not robust enough to safely handle these types of installations, especially without a partition table. LVM uses the second 512byte sector to store its pvlabel (by default). In an MBR environment, this would area would be used for grub2's core.img data. Im not sure what happens to the core.img in a partitionless environment, but I suspect it does the same thing.

I attempted to get a similar environment running, but gave up after hitting the same road blocks you are.

  Jack Waterworth, Red Hat Certified Architect
  OpenStack Technical Support North America
  Red Hat Global Support Services ( 1.888.467.3342 )

On 02/15/2015 05:44 AM, Andrei Borzenkov wrote:
В Sat, 14 Feb 2015 22:35:30 -0500
Dylan Taft <address@hidden> пишет:

Before I go crazy with this,
this patch would also probably solve the issue.  Is support for
something like that already upstream?  LVM can leave enough space for
grub to use for the complete boot loader with bootloaderareasize and
that completely avoids the headache with block maps.

As you could see, this specific patch was rejected by grub maintainer,
unfortunately nothing followed it.

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