[linux-lvm] "/boot" under LVM2 support in lilo or grub

[linux-lvm] "/boot" under LVM2 support in lilo or grub

[Greg Hartzog]

[-- Attachment #1: Type: text/plain, Size: 307 bytes --]

Hello there everyone.

 

I found from poking around the web that lilo, in theory, supports having
"/boot" under LVM2 control rather then existing as its own partition.

 

I was wondering if anyone can confirm or deny this.  And if anyone has any
docs on how to configure or setup this up.

 

Thanks!

 


[-- Attachment #2: Type: text/html, Size: 2212 bytes --]

Re: [linux-lvm] "/boot" under LVM2 support in lilo or grub

[Dieter Stüken]

Greg Hartzog wrote:
> I found from poking around the web that lilo, in theory, supports having 
> �/boot� under LVM2 control rather then existing as its own partition.

this would be really nice to see. Most FAQs advise you to partition your
disk. But my PV is about 5TB, which stupid DOS partitioning can't handle
anyway. I think it should be possible to have a small LV containing
the /boot directory. With my PE size of 32M, I don't even have to worry
if it is contiguous, as it will fit into a single PE. The very first
sector of a PV seems to be unused by LVM, thus a Lilo or Grub MBR may be 
installed. The remaining problem is to set up the mapping for LILO or
Grub to load further stages and the kernel itself.

I looked into the LILO sources and indeed found some fragments dealing
with LVM when trying to get the physical sector numbers of the files to
load (using FIBMAP). But I'm still searching where this is documented.

The Grub development seems to be focused mainly on wired mutiboot
problems with DOS and Windows XY. The whole system fundamentally
depends on the concept of a partition table to solve problems
I will never have :-)

Dieter.

Re: [linux-lvm] "/boot" under LVM2 support in lilo or grub

[Luca Berra]

On Wed, May 17, 2006 at 09:26:05PM +0200, Dieter St�ken wrote:
>Greg Hartzog wrote:
>>I found from poking around the web that lilo, in theory, supports having 
>>?/boot? under LVM2 control rather then existing as its own partition.
>
>this would be really nice to see. Most FAQs advise you to partition your
>disk. But my PV is about 5TB, which stupid DOS partitioning can't handle

http://www.saout.de/misc/

L.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
 /"\
 \ /     ASCII RIBBON CAMPAIGN
  X        AGAINST HTML MAIL
 / \

RE: [linux-lvm] "/boot" under LVM2 support in lilo or grub

[Greg Hartzog]

[-- Attachment #1: Type: text/plain, Size: 921 bytes --]

My thanks to everyone for answering.

 

From the lilo author, I found that my choices are for "/boot" to either be
on RAID-1 or to be under LVM.  But both are not allowed.

 

So I am considering what to do next.

 

What is the state of the LVM mirroring code?  Could I create mirrored
logical volumes in LVM rather then putting LVM on top of RAID-1 md?

 

Thanks!

 

  _____  

From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On
Behalf Of Greg Hartzog
Sent: Wednesday, May 17, 2006 10:09 AM
To: linux-lvm@redhat.com
Subject: [linux-lvm] "/boot" under LVM2 support in lilo or grub

 

Hello there everyone.

 

I found from poking around the web that lilo, in theory, supports having
"/boot" under LVM2 control rather then existing as its own partition.

 

I was wondering if anyone can confirm or deny this.  And if anyone has any
docs on how to configure or setup this up.

 

Thanks!

 


[-- Attachment #2: Type: text/html, Size: 5825 bytes --]

Re: [linux-lvm] "/boot" under LVM2 support in lilo or grub

[Luca Berra]

On Thu, May 18, 2006 at 03:51:17PM -0400, Greg Hartzog wrote:
>My thanks to everyone for answering.
>
> 
>
>>From the lilo author, I found that my choices are for "/boot" to either be
>on RAID-1 or to be under LVM.  But both are not allowed.
>
it depends on what you intend for raid1
the lilo device mapper patch only supports linear maps, so 
you cannot use it with dm-mirror.
but /boot over lvm over md always worked fine.

L.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
 /"\
 \ /     ASCII RIBBON CAMPAIGN
  X        AGAINST HTML MAIL
 / \