Re: problem with grub

[Gilles Guiot <gilles.guiot@saros.fr>]

hh.eu@gmx.de a écrit :
> Am 2008-05-15 um 11:14 schrieb Gilles Guiot:
> > Hello all,
> >
> > I'm a newbie to Linux. I have a Dell server with two raid arrays (sda 
> > and
> > sdb), both raid 1.  I created and LVM on sdb. After having copied the
> > filesystem from sda onto sdb, I want to configure grub so that it 
> > boots on
> > sdb.
>
> Could you clarify what your setup is?
>
> Do you have two disks, sda and sdba, which together form *one* RAID1 
> array, or
> do you have two partitions on each of the two disks and use two RAID1 
> arrays,
> or...?

my server has two raid1 arrays, each with two disks, for a total of four 
hd. sda1 relates to the biggest partion on the first array (sda) and 
sdb1 relates to the only partition on the second raid array. point is 
this sdb1 is "in lvm" so to speak, ie there is an lv using all of the 
partition.

> I don't quite understand why you only create LVM on sdb, not on sda,
> and what you mean by "copying the filesystem from sda to sdb".
This is an installed and working server. Because we needed more space 
for backuppc, the initial plan was to create an lvm on the second raid 
array, boot to it and see if it worked, if so extend it by incorporating 
the first raid array.
> You probably mean you have two partitions on disks sda and sdb, one small
> partition and a larger partition. Then you put the two small partitions
> together in RAID1 and use it for /boot. You also put the two larger 
> partitions
> together into another RAID1 array and use this for LVM.
>
> And now you want to make sure you can boot your system either from sda 
> or sdb,
> i.e. you can start the system even if one disk has failed, correct?
>
> > when i type grub> root (sdb,0) , i get the message : syntax error near
> > unexpected token '('.
> > Could someone tell me what's my mistake and how to do it properly ?
>
> Do you type "grub> root (sdb,0)" (without the "") all in one line? If 
> so, you
> have misunderstood the instructions! You first need to type "grub", 
> then press
> enter, this will get you to the GRUB command, i.e. you will see a command
> prompt of "grub>" at the left. Only then you have to enter "root 
> (sdb,0)" and
> all the other commands (each followed by pressing enter and without 
> the "").
I typed the first grub to enter the grub command, omitted to specifiy it 
. Apologies.

> -Moritz


--
Gilles Guiot
Responsable exploitation informatique
Tél. : 01 53 23 02 20
gilles.guiot@saros.fr