mdadm fail with segmentation error when started "mdadm --assemble --scan", like in suse 10.1 default initrd image. Installation of additional CDs is not possible, as well as normal booting.

SOLUTION:
stable version of mdadm (in distribution or available as additional download)

WORKAROUND:
- after cd1 install boot rescue mode
- manualy assemble raid (ex. "mknod /dev/md0 b 9 0" etc., "mdadm -A /dev/md0 /dev/hda1 /dev/hdb1")
- mount / partition ("mount /dev/md0 /mnt")
- modify initrd ("mkdir /mnt/root/init", "cp /mnt/boot/initrd /mnt/root/init", "gunzip initrd", "cpio -i initrd", "rm /mnt/root/initrd", "vi init", find all lines that call mdadm with --scan option and comment them, add your custom raid assembly commands like "mdadm -A /dev/md0 /dev/hda1 /dev/hdb1" etc.)
- make new initrd ("cd /mnt/root/init", "find . | cpio -co | gzip > /mnt/boot/initrd_new")
- remove /boot/initrd link and replace it with a new one ("cd /boot", "rm initrd", "ln -s initr_new initrd")

That should do the trick to finish the installation.