I'm using raidtools, after some wrong modification I made in /etc/raidtab my server fail to start.
So I add to fix the it by booting from rescue CD and edit raidtab.

I far as I understand raidtools is user interface for set raid configuration in the kernel,
so why it involve at boot time?

I would like to migrate on production server from raidtools to mdadm and it is not clear to me how to do it?