Software Raid's

Building a RAID1 (boot) / RAID5 (root) with ASUS P5GDC-V Deluxe
For the fast and furious:

tools:

• mdadm
• jfsutils

Most important steps for /dev/md0

1. Install Lilo 22.6
2. mknod /dev/md0 b 9 0
3. mdadm -Cv /dev/md0 -l1 -n4 -c128 missing /dev/sdb1 /dev/sdc1 /dev/sdd1
4. mkfs.jfs /dev/md0
5. umount /boot
6. mdadm -a /dev/md0 /dev/sda1 -> (4 disks=[UUUU], only possible if /boot not mounted)
7. mkdir /mnt/newroot
8. mount /dev/md1 /mnt/newroot (do not yet hot-add the 4th disk!)
9. mkdir /mnt/newroot/boot
10. mount /dev/md0 /mnt/newroot/boot
11. find . -xdev | cpio -pm /mnt/newroot (do not use: cp -ax / /mnt/newroot!!)
12. fdisk /dev/sda and make /dev/sda1 and /dev/sda3 "fd"
13. mount -o bind /dev /mnt/newroot/dev/
14. mount -o bind /proc /mnt/newroot/proc/
15. chroot /mnt/newroot /bin/bash/
16. Edit lilo.conf so boot = /dev/md0
17. Lilo -x mbr (Thanks John!!)
18. Edit /etc/fstab
19. The End: Do not forget to 'fd' /dev/sda1 and /dev/sda3
20. If you can not mount /dev/md0 redo mkfs.jfs.
21. Do not forget: To mdadm -a you must boot on md1.

• Software Raid Howto
• Intel Server Configurator

Speed Settings for Syncing

• /proc/sys/dev/raid/speed_limit_min
• echo 50000 >/proc/sys/dev/raid/speed_limit_min

Console Error

... Gentoo braucht ein /dev/console Device _bevor_ udev geladen werden kann.

• > mount / -o bind /mnt

... und dann die zwei Devices console und null erstellen:

• > mknod /mnt/dev/console c 5 1
• > mknod /mnt/dev/null c 1 3

... und dann natürlich wieder unmounten..

• > umount /mnt

When having Lilo problems

1. boot from CD
2. mknod /dev/md0 b 9 0
3. mknod /dev/md1 b 9 1
4. mdadm --assemble --run /dev/md0 /dev/hda1
5. mdadm -a /dev/md0 /dev/hdc1
6. mount /dev/md1 /mnt/gentoo
7. mount /dev/md0 /mnt/gentoo/boot
8. mount -o bind /dev /mnt/gentoo/dev
9. mount -o bind /proc /mnt/gentoo/proc
10. lilo -x mbr