[linux-lvm] Recognizing VG in another machine

[linux-lvm] Recognizing VG in another machine

[Garcia JR]

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Hi PPL, little question.

Supposing i have 1 HD with 2 pvs (hda1 and hda3) in VG named VG01 and LV
named lv01 working successfully in MACHINE1.

root@solid:/etc/lvmconf# lvscan
lvscan -- ACTIVE            "/dev/vg01/lv01" [704 MB]
lvscan -- 1 logical volumes with 704 MB total in 1 volume group
lvscan -- 1 active logical volumes

root@solid:/etc/lvmconf# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- ACTIVE   PV "/dev/hda1" of VG "vg01" [1.41 GB / 1.41 GB free]
pvscan -- ACTIVE   PV "/dev/hda3" of VG "vg01" [1.41 GB / 736 MB free]
pvscan -- total: 2 [2.91 GB] / in use: 2 [2.91 GB] / in no VG: 0 [0]

Supposing again: MACHINE1 is down and I need to put VG above in another
server, named MACHINE2. I Will remove HD from MACHINE1 and put in MACHINE2.

What the nexts steps i will have to follow to make VG be recognized by
MACHINE2 exactly how was in MACHINE1 without lose data?

regards,

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Re: [linux-lvm] Recognizing VG in another machine

[Heinz Mauelshagen]

On Mon, Feb 13, 2006 at 09:40:54PM -0300, Garcia JR wrote:
> Hi PPL, little question.
> 
> Supposing i have 1 HD with 2 pvs (hda1 and hda3) in VG named VG01 and LV
> named lv01 working successfully in MACHINE1.
> 
> root@solid:/etc/lvmconf# lvscan
> lvscan -- ACTIVE            "/dev/vg01/lv01" [704 MB]
> lvscan -- 1 logical volumes with 704 MB total in 1 volume group
> lvscan -- 1 active logical volumes
> 
> root@solid:/etc/lvmconf# pvscan
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- ACTIVE   PV "/dev/hda1" of VG "vg01" [1.41 GB / 1.41 GB free]
> pvscan -- ACTIVE   PV "/dev/hda3" of VG "vg01" [1.41 GB / 736 MB free]
> pvscan -- total: 2 [2.91 GB] / in use: 2 [2.91 GB] / in no VG: 0 [0]
> 
> Supposing again: MACHINE1 is down and I need to put VG above in another
> server, named MACHINE2. I Will remove HD from MACHINE1 and put in MACHINE2.
> 
> What the nexts steps i will have to follow to make VG be recognized by
> MACHINE2 exactly how was in MACHINE1 without lose data?

vgscan ; vgchange -ay

presumably the filter in /etc/lvm/lvm.conf includes /dev/hd* (which it
does by default).

> 
> regards,

> _______________________________________________
> 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/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Cluster and Storage Development                   56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
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[linux-lvm] Booting into LVM

[Roger Lucas]

I am trying to boot into LVM and am having some problems.  Here is a
summary:

I have a server with a hardware RAID system (which provides logical SCSI
disks) which I want to have running as early as possible in the boot
process.  I cannot boot directly into it, so I have a small (32MB) IDE-FLASH
device onto which I wish to put a standard Linux boot partition.  My plan is
to install LVM onto the (large) RAID system and use logical volumes for "/",
"/var/", etc.

I did a "stock" Debian install and it all worked fine.  The boot partition
is on the IDE-FLASH disk and all the other partitions are via LVM on logical
volumes from the 4TB RAID array.  Unfortunately, the kernel is 2.6.8.  I
need to run 2.6.14 so I built up a new kernel image using the original
sources and a load of patches that I needed.  This kernel image works fine
on other machines, but it will not boot on this machine.  It complains that
it cannot mount "mapper/root" when the Grub line is "root=/dev/mapper/root".

My guess is that LVM isn't being loaded/started/configured correctly at boot
time or that there is some problem with "/dev"...

Can anyone shed any light on this?

Thanks,

Roger

Re: [linux-lvm] Booting into LVM

[Graham Wood]

Roger Lucas wrote:
> My guess is that LVM isn't being loaded/started/configured correctly at boot
> time or that there is some problem with "/dev"...
>
> Can anyone shed any light on this?
>   
I believe that 2.6.14 is after devfs stopped being supported, so you're 
going to have to go with udev instead - which also means that mkinitrd 
isn't going to work either.  (I think there's lvm2 compatability issues 
as well, but I just went for Sid instead of trying to get sarge working 
with a new kernel)

If you google for 'debian sarge udev' there are quite a few pages that 
give details about what needs to be done - although they may not be 
exactly what you're after...

If that isn't the answer then I'm sure we can help you work through it :)

RE: [linux-lvm] Booting into LVM

[Roger Lucas]

Hi Graham,

Thanks for the quick reply.  I had missed the whole "no devfs if >= 2.6.14"
problem, although significant Google-ing had already been done :-)

I'm following through everything now.

Thanks again,

Roger

> -----Original Message-----
> From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com]
> On Behalf Of Graham Wood
> Sent: 17 February 2006 14:12
> To: LVM general discussion and development
> Subject: Re: [linux-lvm] Booting into LVM
> 
> Roger Lucas wrote:
> > My guess is that LVM isn't being loaded/started/configured correctly at
> boot
> > time or that there is some problem with "/dev"...
> >
> > Can anyone shed any light on this?
> >
> I believe that 2.6.14 is after devfs stopped being supported, so you're
> going to have to go with udev instead - which also means that mkinitrd
> isn't going to work either.  (I think there's lvm2 compatability issues
> as well, but I just went for Sid instead of trying to get sarge working
> with a new kernel)
> 
> If you google for 'debian sarge udev' there are quite a few pages that
> give details about what needs to be done - although they may not be
> exactly what you're after...
> 
> If that isn't the answer then I'm sure we can help you work through it :)
> 
> _______________________________________________
> 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/