Hi, OK, so I'm confused. This is very, very basic stuff I think. The first line of Neil's page http://neil.brown.name/blog/mdadm says "mdadm is a tool for managing Linux Software RAID arrays" which is the way I've used it, but I'm just a casual home user. However there are and number of threads here where pros far more knowledgeable than I point people toward possibly purchasing hardware RAID controllers. Is this about something like creating a nested RAID using two or more underlying hardware RAIDs instead of just individual drives? Or is there something else going on here? Thanks, Mark -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html