Working with Linux software RAID
RAID (an acronym for redundant array of independent disks) is a method whereby information is spread across several disks in one of several ways called "RAID levels". Depending on what level of redundancy and/ or performance is required. Most RAID levels will allow you to keep systems up and running, in case of common hardware problems (disk failure). It is not in itself a complete data safety solution. This is very important to realize.