Comment 5 for bug 220493

I can confirm this works on my NVidia fakeraid. I booted the Hardy live CD and ran:

dpkg -i linux-ubuntu-modules-2.6.24-16-generic_2.6.24-16.23ubuntu4_i386.deb
dmraid -ay

Looks like the module was renamed from dm-raid4-5 to dm-raid45, thanks Stefan!

Prince, the reason you're getting that error is because the module is not being loaded at boot. That's ok as long as you're not booting from the array. If you do want it loaded at boot time you're going to have to modify your initrd:

apt-get install initramfs-tools
echo "dm-raid45" >> /etc/initramfs-tools/modules
update-initramfs -u

You might have to reinstall dmraid as well, not sure.