Re: [gentoo-user] installation / grub boot problem

["Charles R., Porter" <akachuck@cox.net>]

Heping He wrote:
> Hi, I tried to install gentoo on my AMD 64 dual core machine. It has
> four 500 GB HDs. I followed the instruction on
> http://www.gentoo.org/doc/en/gentoo-x86+raid+lvm2-quickinstall.xml. I
> replaced /dev/md4 with raid5 instead of raid0. Here is the list of
> each HD's partitiion:
>
> /dev/sda:
> partition #,  boot   start    end     type
> 1                  *        1        18     fd
> 2                           19       361   fd
> 3                            362     end  fd
>
> /dev/sdb
> partition #,  boot   start    end     type
> 1                           1        361     82
> 2                           362     end    fd
>
> /dev/sdc is the same to /dev/sda, and /dev/sdd = /dev/sdb
>
> I created /dev/md1, /dev/md3 and /dev/md4:
> mknod /dev/md1 b 9 1
> mknod /dev/md3 b 9 3
> mknod /dev/md4 b 9 4
>
> and then form raid:
> mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sda1 /dev/sdc1
> mdadm --create /dev/md3 --level=1 --raid-devices=2 /dev/sda2 /dev/sdc2
> mdadm --create /dev/md4 --level=5 --raid-devices=4 /dev/sda3 /dev/sdb2
> /dev/sdc3 /dev/sdd2
>
> /dev/sdb1 and /dev/sdd1 forms the swap space
>
> mount:
> mount /dev/md3 /mnt/gentoo
> mount /dev/md1 /mnt/gentto/boot
>
> /dev/md4 is for lvm2 and /usr, /home,  /opt and other common unix dir
> are created there
>
> after chroot and emerge, I issued emerge grub and modified
> /boot/grub/grub.conf
>
> default 0
> timeout 10
>
> title gentoo
> root (hd0,0)
> kernel /boot/kernel root=/dev/md3
>
> and issue grub
> grub> root (hd0,0)
> ....
> grub> setup (hd0)
> ....
> grub> root (hd2,0)
> .....
> grub> setup (hd2)
> .....
> grub> quit
>
> When I reboot, the kernel issued a panic msg: it says can't read
> /dev/md/3 or (hd2,0) is invalid device.
>
> Any idea what went wrong?
>
> Thanks in advance for any suggestion.
>
> --HH
I'm running a similar RAID setup and I found that I must add   "
root=/dev/md3 md=3,sda3,sdb3,hda3 ".    It seems that md3 must be
defined.  At least I had kernel panics until I added this.

Chuck