Disk Redundancy Research
RAID (Redundant Array of Independent Disks) uses two or more drives in combination to create a fault-tolerant system that protects against physical hard drive failure and increases hard drive performance (Microsoft, 2011). RAID is used to improve the performance of a computer and the data redundancy can give you an extra layer of security. The following are types of RAID used in the industry today:
RAID 0 - (Striped Set), splits the data evenly across two or more disks (Wired Tree, 2010). The OS “sees” the disks as one hard drive. RAID 1- (Mirrored Set) creates an exact copy of data on two or more disks (Wired Tree, 2010). If one hard drive fails then you have a back up on the second hard drive. RAID 5- (Striped Set Parity) uses block-level striping with parity (a technique of checking whether data has been lost or written over when it's moved from one place in storage to another or when transmitted between computers (Rouse, 2005)) data distributed across all disks in the RAID array. If one drive fails, the system will remain functional until a scheduled drive replacement can be installed (Wired Tree, 2010). RAID 6- (Striped Set Dual Parity) essentially an extension of RAID 5 that allows for additional fault tolerance by using a second independent distributed parity scheme (dual parity) (Enhance Technology, Inc., 2012) RAID 0 allows larger logical disks to be created out of multiple physical disks and to improve performance through simultaneous access of the disks. RAID 1 could be the most expensive because of the number of physical drives needed to make it work properly. If the client has important information, RAID 1 gives them a built in back up to protect against hard drive failure. As a home computer user, I would use Raid 0 for the performance boost it gives. I don’t have a lot of “important” data to be backed up because most of my important information fits on a USB stick. Software RAID is less expensive than hardware RAID and...
Cited: Enhance Technology, Inc. (2012, January 1). Leveraging the benefits of RAID 6. Retrieved from Enhance Technology, Inc.: http://www.enhance-tech.com/press/Press%20How%20RAID%206%20Work.htm
Joan, B. (2010, January 11). Difference Between Hardware RAID and Software RAID. Retrieved from Differencebetween.net: http://www.differencebetween.net/technology/difference-between-hardware-raid-and-software-raid/
Microsoft. (2011). Introducing Redundant Array of Independent Disks. In Microsoft, Windows Server Administration Fundamentals (pp. 68-69). Danvers: Wiley.
Rouse, M. (2005, May 1). Definition Parity. Retrieved from SearchStorage: http://searchstorage.techtarget.com/definition/parity
Wired Tree. (2010, January 25). What does RAID stand for and what are the different levels? Retrieved from Wired Tree: https://helpdesk.wiredtree.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1414
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