Re: Debian + LVM + RAID1

["Damon L. Chesser" <damon@damtek.com>]

Ivan Glushkov wrote:
> Damon L. Chesser wrote:
>   
> > SNIP
> >     
> > > I have this line in /boot/grub/menu.lst
> > >
> > > I tried in the following sequence to:
> > >
> > > 0. boot resque
> > > 1. mount /boot from raid1 and the other directories from the lvm volumes
> > >
> > > 1. enter lvm into /etc/modules,
> > > 2. rebuild initrd with:
> > >
> > >  mkinitramfs -o /boot/grub/initrd.img-2.6.24-1-amd64
> > >
> > > 3. install grub into the MBR of both disk with
> > >
> > > grub-install /dev/sdc
> > > grub-install /dev/sdd
> > >
> > > but still the same message appears when I try to boot :(
> > >
> > > How can I check if the lvm support is really seen by grub?
> > > I find this (http://grub.enbug.org/LVMandRAID) article claiming that I
> > > have to enter "insmod lvm" in a file named grub.cfg. But I don't have a
> > > file like this in my system?!
> > >
> > >  
> > >   
> > >       
> > Ivan,
> >
> > As for LVM support for grub:  the MBR has files pointing to your "root"
> > which in this term means place where the grub files are which is NOT in
> > an LVM.  In your case this should be /dev/md0 or however GRUB reads that
> > (I confess, I don't know).  I just installed, in a vm, debian using this
> > image:
> > http://ftp.nl.debian.org/debian/dists/etch/main/installer-amd64/current/images/netboot/mini.iso
> > which should be current snapshot of testing, net install mini.iso.  I
> > did that to make sure we had the same OS.
> >
> > I partitioned two 8G drives thusly:  1 120MB primary, 1 6.5GB extended. 
> > I made the 1st partition into a raid1 (md0) and made the 2nd into a
> > raid1 (md1)
> >     
>
> Just two short questions here:
> 1. Did you format the md0 raid, and if yes, did you mount it?
> 2. Where is your /boot? On the root logical volume?
>
> 	Thanks in advance
>
>   
> > I put an a swap file on each drive (1.5G each, why run raid on a swap?
> > double your swap file space and you can ping between the two if you need
> > them)
> >
> > I put LVM (System) on top of md1 and divided that into two logical
> > volumes (root 4.5G and home 2G or so)
> >
> > I then was asked to install Grub into MBR of (hd0,0) which I agreed to.
> >
> > rebooted.  works just fine.
> >
> > Cut your losses, if you have a network install, just do it again (unless
> > you are metered) and this time install grub on the physical HD.  Then
> > use the grub command to mirror it to the raid1 member.
> >
> > HTH.
> >
> >     
>
>   
In light of the LVM and RAID article, I guess you can put grub on a LVM 
or a mddevice.  However, grub during the install portion of debian, 
testing did not do that, it defaulted to hd0,0 and I took it.  Is that 
the difference between my working install and your non-booting install?

--
Damon L. Chesser
damon@damtek.com
http://www.linkedin.com/in/dchesser