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Re: LMV2 boot from another Volume Group?



On 09-07-27 13:08:33, Aldo Foot wrote:
> On Sun, Jul 26, 2009 at 8:40 PM, Tony
> Nelson<tonynelson georgeanelson com> wrote:
> > I have two hard drives I want to boot from, each with its own LVM2
> > Volume Group.  I can boot from the one on the same drive as Grub,
> > but not from the other one.  Apparantly, only Logical Volumes from 
> > the boot drive's Volume Group are detected before / is mounted 
> > (something about "activation", perhaps?).  Googling only shows how 
> > to detect Volume Groups and activate Logical Volumes after / is 
> > mounted.  I can't find any kernel LVM parameters that would affect 
> > this (and I'd need the LVM stuff built-in to the kernel, not as a 
> > module).
> >
> > Can Linux use a Volume Group that isn't on Grub's boot volume?
> >
> > Must I add a boot partition on the second disk and chainload to it?
> 
> ____
> 
> Are you saying that you have /boot in a VG and you can boot from it?

No.

> Not sure what you mean by "activate". The LVs are treated like any
> other partition with its filesystem that it's checked at boot time. 
> There is no "switch" o turn LVs on and off, except for the entry in /
> etc/fstab that looks for a device to check and mount according to 
> what you specify.

This is wrong.  In order to use an LVM Logicial Volume, first a 
`vgscan` may be needed to make the Volume Groups known, and then the 
desired Logical Volumes must be Activated with `vgchange -ay`.  Only 
Available Logical Volumes can be mounted.

-- 
____________________________________________________________________
TonyN.:'                       <mailto:tonynelson georgeanelson com>
      '                              <http://www.georgeanelson.com/>



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