RAID is an acronym first defined by David A. Patterson, Garth A. Gibson and Randy Katz at the University of California, Berkeley in 1987 to describe a Redundant Array of Inexpensive Disks, a technology that allowed computer users to achieve high levels of storage reliability from low-cost and less reliable PC-class disk-drive components, via the technique of arranging the devices into arrays for redundancy.
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dr.raid's rants on hacking, information security, and the whoring of talent that ... Blog Archive. 2009 (5) April (1) This is what we needed. March (3) No Moar ...drraid.blogspot.com/Blog: Shipyard School Raid, An Annual 7 Day Sailing and Rowing Race for ...
Blog: 2007 Shipyard School Raid, August 31-September 6, Gabriola Island, BC ... on the Raid this evening--and there are more photos of Raid Mothers and Minders ...www.shipyardraid.ca/blog/Primitive Air-Raid Blog
Primitive Air-Raid Blog. Featuring Jizzon's photoraphy, podcasts and the odd record review. ... I stream songs on my blog as an added feature for my music reviews. ...blog.primitiveairraid.com/Tobold's MMORPG Blog: WoW raid lockouts
A blog mostly about MMORPG ( Massively Multiplayer Online Role ... WoW raid lockouts. Tobold's MMORPG Blog. Monday, September 24, 2007. WoW raid lockouts ...tobolds.blogspot.com/2007/09/wow-raid-lockouts.htmlRaid Recovery Blog
What is a RAID system? ... Initially the thought in creation of RAID systems was that these coupled disks ... real strength of RAID systems is their inherent ...raidrecoveryblog.wordpress.com/RAID is an acronym first defined by David A. Patterson, Garth A. Gibson and Randy Katz at the University of California, Berkeley in 1987 to describe a Redundant Array of Inexpensive Disks, a technology that allowed computer users to achieve high levels of storage reliability from low-cost and less reliable PC-class disk-drive components, via the technique of arranging the devices into arrays for redundancy.
More recently, marketers representing industry RAID manufacturers reinvented the term to describe a Redundant Array of Independent Disks as a means of disassociating a "low cost" expectation from RAID technology.
"RAID" is now used as an umbrella term for computer data storage schemes that can divide and replicate data among multiple hard disk drives. RAID's various designs all involve two key design goals: increased data reliability or increased input/output performance. When multiple physical disks are set up to use RAID technology, they are said to be in a RAID array. This array distributes data across multiple disks, but the array is seen by the computer user and operating system as one single disk. RAID can be set up to serve several different purposes.
Purpose and basics
Redundancy is achieved by either writing the same data to multiple drives (known as mirroring), or writing extra data (known as parity data) across the array, calculated such that the failure of one (or possibly more, depending on the type of RAID) disks in the array will not result in loss of data. A failed disk may be replaced by a new one, and the lost data reconstructed from the remaining data and the parity data. Organizing disks into a redundant array decreases the usable storage capacity. For instance, a 2-disk RAID 1 array loses half of the total capacity that would have otherwise been available using both disks independently, and a RAID 5 array with several disks loses the capacity of one disk. Other types of RAID arrays are arranged so that they are faster to write to and read from than a single disk.
There are various combinations of these approaches giving different trade-offs of protection against data loss, capacity, and speed. RAID levels 0, 1, and 5 are the most commonly found, and cover most requirements.
- RAID 0 (striped disks) distributes data across several disks in a way that gives improved speed and no lost capacity, but all data on all disks will be lost if any one disk fails. Although such an array has no actual redundancy, it is customary to call it RAID 0.
- RAID 1 (mirrored settings/disks) duplicates data across every disk in the array, providing full redundancy. Two (or more) disks each store exactly the same data, at the same time, and at all times. Data is not lost as long as one disk survives. Total capacity of the array equals the capacity of the smallest disk in the array. At any given instant, the contents of each disk in the array are identical to that of every other disk in the array.
























