Software RAID vs Hardware RAID

NT offers native support for software-based redundant arrays of inexpensive disks (RAID). RAID is a drive configuration that uses multiple drives to provide higher speed and greater data protection than a single drive. NT can combine multiple independent drives into a RAID configuration through its disk subsystem components. In other words, NT performs all of the complicated disk read and write activities necessary to create RAID sets. This is known as software-based RAID. It has the advantage of being cheap, because it is built into Windows NT. However, it is minimally useful as a performance improvement tactic. NT provides RAID from software by using the CPU and other system resources to process disk reads and writes. For systems with minimal disk access, performance is improved; however, for systems with significant disk access, performance is severely degraded.

Hardware RAID devices are specialty drive devices that host multiple drives external to the computer system. Hardware RAID devices manage all of the disk reads and writes independent of the operating system. This provides several benefits, including true high-performance disk access. Hardware RAID does not tax the CPU or other system resources because a hardware RAID device requires no more processing power than a standard disk drive. In fact, the OS is typically unaware that the disk device is RAID hardware. The only drawback to hardware RAID is the cost. A RAID device typically costs two to ten times as much as a comparable non-RAID drive (or set of drives).

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