Thanks for all the answers. Can you tell me if this Howto is a good starting point for reading? http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html (It seems a bit old and to only know about lilo. At first glance it doesn't convince me.) Or do you think the info in http://www.centos.org/docs/4/html/rhel-sag-en-4/ is enough to get going? Kai -- Kai Schätzl, Berlin, Germany