RAID

Redundant Array of Independent Disks, or RAID, is a way of storing content on multiple hard disk drives concurrently. A RAID could be software or hardware based on the hard drives which are used - physical or logical ones, but what’s common between them is that they all function as a single unit where info is kept. The key advantage of using a RAID is redundancy because the data on all of the drives is the same all of the time, so even in case one of the drives fails for whatever reason, the data will still be available on the rest of the drives. The general performance is also better since the reading and writing processes could be split between a number of drives, so a single one will not be overloaded. There are different types of RAIDs where the capabilities and fault tolerance can vary based on the specific setup - whether information is written on all of the drives in real time or it's written on a single drive and after that mirrored on another, the number of drives are used for the RAID, etcetera.