Software RAID means you can setup RAID without need for a dedicated hardware RAID controller. Home, prosumer, and small business NASes are increasingly shipping with two or more disk drive bays so that users can leverage the power of RAID just like an enterprise can. Because of the increased storage demands of consumers, home NAS devices also support RAID. These systems feature multiple SSD or SATA drives, depending on the RAID configuration. Servers and NASes in business datacenters typically have a RAID controller-a piece of hardware that controls the array of disks. RAID is traditionally implemented in businesses and organizations where disk fault tolerance and optimized performance are must-haves, not luxuries. Different RAID levels represent different configurations aimed at providing different balances between performance optimization and data protection. A business will generally find it more urgent to keep data intact in case of hardware failure than, for example, a home user will. RAID levels depend on how many disks you have in a storage device, how critical drive failover and recovery is to your data needs, and how important it is to maximize performance. The way in which you configure that fault tolerance depends on the RAID level you set up.
Fault tolerance lessens interruptions in productivity, and it also decreases the chance of data loss. Fault tolerance simply means providing a safety net for failed hardware by ensuring that the machine with the failed component, usually a hard drive, can still operate. In general, a RAID-enabled system uses two or more hard disks to improve the performance or provide some level of fault tolerance for a machine-typically a NAS or server. If you've ever looked into purchasing a NAS device or server, particularly for a small business, you've no doubt come across the term "RAID." RAID stands for Redundant Array of Inexpensive (or sometimes "Independent") Disks.
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