Raid on Linux

Motivation

While they have gotten significantly more reliable in the last years, hard-disk are still the parts that most often fail in computers and they contain all your data. Thus you should always have a good and recent Backup. But if your server crashes because of a defective hard-drive this is still bad as it means the server is not available and you might need a significant amount of time to restore your data. What we want is a system that can tolerate the failure of a disk and still work. This is what RAID is for.