[linux-lvm] lvm on centos with raid1 and grub

[linux-lvm] lvm on centos with raid1 and grub

[Sterpu Victor]

After a reboot I couldn't boot from none of my hdd's.
I receive just a grub console. Now I must reinstall grub, but in order 
to do this I need to know the name of the root partion in the LVM.
To find out this I moved one of the hdd's in another computer and I 
tried to mount the LVM partition.

I do "modprobe dm-mod" and when I do "vgchange -ay" I get the message:
  File descriptor 3 left open
  File descriptor 5 left open
  File descriptor 7 left open
  No volume groups found
I have no LVM devices in /dev.
The alternative is to reinstall the OS, but....

Thank you.

Re: [linux-lvm] lvm on centos with raid1 and grub

[Sterpu Victor]

I do need a fast answer if possible.
So the quick question is "How can I mount a LVM partition, made on a 
RAID partition on another computer?"
Thank you.

Sterpu Victor wrote:

> After a reboot I couldn't boot from none of my hdd's.
> I receive just a grub console. Now I must reinstall grub, but in order 
> to do this I need to know the name of the root partion in the LVM.
> To find out this I moved one of the hdd's in another computer and I 
> tried to mount the LVM partition.
>
> I do "modprobe dm-mod" and when I do "vgchange -ay" I get the message:
>  File descriptor 3 left open
>  File descriptor 5 left open
>  File descriptor 7 left open
>  No volume groups found
> I have no LVM devices in /dev.
> The alternative is to reinstall the OS, but....
>
> Thank you.
>
>
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>

Re: [linux-lvm] lvm on centos with raid1 and grub

[Fabien Jakimowicz]

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On Fri, 2006-09-08 at 13:42 +0300, Sterpu Victor wrote:
> I do need a fast answer if possible.
> So the quick question is "How can I mount a LVM partition, made on a 
> RAID partition on another computer?"
> Thank you.
> 
> Sterpu Victor wrote:
> 
> > After a reboot I couldn't boot from none of my hdd's.
> > I receive just a grub console. Now I must reinstall grub, but in order 
> > to do this I need to know the name of the root partion in the LVM.
> > To find out this I moved one of the hdd's in another computer and I 
> > tried to mount the LVM partition.
> >
> > I do "modprobe dm-mod" and when I do "vgchange -ay" I get the message:
> >  File descriptor 3 left open
> >  File descriptor 5 left open
> >  File descriptor 7 left open
> >  No volume groups found
> > I have no LVM devices in /dev.
> > The alternative is to reinstall the OS, but....
> >
> > Thank you.
> >
> >
> >
If you are not using raid on the other computer, you should modify
md_component_detection in /etc/lvm/lvm.conf
You can also try to run : pvdisplay /dev/mdx where mdx is your raid
device.
-- 
Fabien Jakimowicz <fabien@jakimowicz.com>

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Re: [linux-lvm] lvm on centos with raid1 and grub

[Les Mikesell]

On Fri, 2006-09-08 at 03:38, Sterpu Victor wrote:
> After a reboot I couldn't boot from none of my hdd's.
> I receive just a grub console. Now I must reinstall grub, but in order 
> to do this I need to know the name of the root partion in the LVM.
> To find out this I moved one of the hdd's in another computer and I 
> tried to mount the LVM partition.
> 
> I do "modprobe dm-mod" and when I do "vgchange -ay" I get the message:
>   File descriptor 3 left open
>   File descriptor 5 left open
>   File descriptor 7 left open
>   No volume groups found
> I have no LVM devices in /dev.
> The alternative is to reinstall the OS, but....
> 

The first thing to try is booting the Centos install
CD with 'linux rescue' at the boot prompt.  If it
detects the existing installation it will mount it and
suggest that you 'chroot /mnt/sysinstall' after which
you will be able to see your old /etc/grub.conf and
have all the usual tools to reinstall grub.

-- 
  Les Mikesell
   lesmikesell@gmail.com

Re: [linux-lvm] lvm on centos with raid1 and grub

[Luca Berra]

On Fri, Sep 08, 2006 at 01:42:38PM +0300, Sterpu Victor wrote:
>I do need a fast answer if possible.
>So the quick question is "How can I mount a LVM partition, made on a 
>RAID partition on another computer?"
>Thank you.
>
Activate the raid

L.

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

Re: [linux-lvm] lvm on centos with raid1 and grub

[Fabien Jakimowicz]

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On Fri, 2006-09-08 at 13:42 +0300, Sterpu Victor wrote:
> I do need a fast answer if possible.
> So the quick question is "How can I mount a LVM partition, made on a 
> RAID partition on another computer?"
> Thank you.
> 
> Sterpu Victor wrote:
> 
> > After a reboot I couldn't boot from none of my hdd's.
> > I receive just a grub console. Now I must reinstall grub, but in order 
> > to do this I need to know the name of the root partion in the LVM.
> > To find out this I moved one of the hdd's in another computer and I 
> > tried to mount the LVM partition.
> >
> > I do "modprobe dm-mod" and when I do "vgchange -ay" I get the message:
> >  File descriptor 3 left open
> >  File descriptor 5 left open
> >  File descriptor 7 left open
> >  No volume groups found
> > I have no LVM devices in /dev.
> > The alternative is to reinstall the OS, but....
> >
> > Thank you.
> >
> >
> >
If you are not using raid on the other computer, you should modify
md_component_detection in /etc/lvm/lvm.conf
You can also try to run : pvdisplay /dev/mdx where mdx is your raid
device.
-- 
Fabien Jakimowicz <fabien@jakimowicz.com>

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Re: [linux-lvm] lvm on CentOS with raid1 and grub

[Lamont R. Peterson]

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On Friday 08 September 2006 02:38am, Sterpu Victor wrote:
> After a reboot I couldn't boot from none of my hdd's.
> I receive just a grub console. Now I must reinstall grub, but in order
> to do this I need to know the name of the root partion in the LVM.
> To find out this I moved one of the hdd's in another computer and I
> tried to mount the LVM partition.

You can not put /boot/ on top of LVM or RAID, except RAID 1 but you have to be 
careful if you need to boot from the second (or later) drive.

There are patches out there for GRUB to allow it to read LVM and they make it 
possible to boot when the /boot/ files are on LVM.  Last I heard, they were 
still officially "experimental" but apparently pretty much working.  I think 
I read somewhere that the plan was to support LVM with GRUB2 when it 
releases, but don't quote me on that, I can't seem to find the reference at 
the moment.

> I do "modprobe dm-mod" and when I do "vgchange -ay" I get the message:
>   File descriptor 3 left open
>   File descriptor 5 left open
>   File descriptor 7 left open
>   No volume groups found
> I have no LVM devices in /dev.
> The alternative is to reinstall the OS, but....
>
> Thank you.
>
>
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

-- 
Lamont R. Peterson <peregrine@OpenBrainstem.net>
Founder [ http://blog.OpenBrainstem.net/peregrine/ ]
GPG Key fingerprint: 0E35 93C5 4249 49F0 EC7B  4DDD BE46 4732 6460 CCB5
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Re: [linux-lvm] lvm on CentOS with raid1 and grub

[Thomas Schwinge]

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Hello!

On Fri, Sep 08, 2006 at 09:34:46AM -0600, Lamont R. Peterson wrote:
> I read somewhere that the plan was to support LVM with GRUB2 when it 
> releases

Correct.  Jeroen Dekkers was (successfully) working on RAID and LVM
support for GRUB as a Google Summer of Code 2006 project.

> I can't seem to find the reference at the moment.

I can help:
<http://lists.gnu.org/archive/html/grub-devel/2006-08/msg00024.html> and
<http://grub.enbug.org/LVMandRAID>.

It's not installed in the main trunk so far, but will be.


Regards,
 Thomas

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