[arch-general] Why Is My RAID Installing Failing?

[dave reisner]

On Tue, Jan 12, 2010 at 9:48 AM, Carlos Williams <carloswill at gmail.com> wrote:
>
> On Mon, Jan 11, 2010 at 3:01 PM, Baho Utot <baho-utot at columbus.rr.com> wrote:
> > Try the params on the /boot/grub/menu.lst line
>
> OK - So I am starting from scratch again since my previous attempt
> failed. I boot from the disk. Load modprobe raid1 modules from command
> line and then create the RAID1 mirror with 'mdadm'. I have recreated
> the partitions:
>
> sda1 = 4 GB /boot (bootable)
> sda2 = the rest of the disk (RAID)
>
> sdb1 = 4 GB SWAP (SWAP)
> sdb2 = the rest of the disk (RAID)
>
> Below I created the same RAID.
>
> #mdadm --create /dev/md0 --level=2 --raid-devices=2 /dev/sda2 /dev/sdb2
>
> **I allowed the mirror to synchronize over night. Right now as I type
> this, the mirror is done syncing.
>
> So according to everything we previously discussed, I don't need to
> mess with anything else and can go into the /arch/setup and configure
> my system, right? I should simply only make changes to my menu.lst as
> noted above, and nothing else when I am prompted to 'Configure
> System'?
>
> So am changing the 'kernel' line in the Grub 'menu.lst' to read as follows:
>
> kernel vmlinuz26 root=/dev/md0 md=2,/dev/sda2,/dev/sdb2 ro
>
> *Note the 'ro' at the end. It was already there before I add your
> suggestion in the middle. Do I take it off or leave it on?*
>
> Please let me know if I have missed anything.

With mdadm in your initrd, you don't need to specify the parameters of
the array in Grub. Foregoing that, the first parameter passed to the
"md" option is the type of raid array (e,g, 0, 1, 456) and not the
number of devices in the array. Sounds good, otherwise.