RAID to Backup Files on Computer

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RAID to Backup Files on Computer Security can mean many things. In the computer world it refers to how safe your data is. For obvious reasons this is of the utmost importance to the business world. A loss of data means a loss of man-hours and a frantic search for hard copy. Most, if not all businesses have hard-to-recreate documents and data that is essential. In the worst case scenario a business will come to a screeching halt and the losses can be catastrophic. In order to keep this from happening various methods have been developed to back up or make copies of data. In 1987 computers were wide spread in large companies. These companies made backup tapes to insure that their data was safe, but it was obvious that there was a need to make improvements. A hard drive death meant that at lest some new data was lost. The search for fault tolerance in computers led to the development of RAID. A group of computer engineers at Berkeley published a paper entitled " A Case for Redundant Arrays of Inexpensive Disks". Hence the acronym RAID. The basic idea was to combine multiple small, inexpensive disk drives into an array of disk drives which yields performance exceeding that of a Single Large Expensive Drive (SLED) . In addition to acting like a sled, the RAID appears to the computer as a single logical storage unit or drive. Five types of array architecture are defined in the Berkeley paper, RAID-1 through RAID-5. The new term RAID-0 is used to refer to a non-redundant array of disk drives. Each provides disk fault tolerance by storing information in various ways. The rest of this paper is going to describe the different RAID levels list the pros and cons of each and describe which RAID levels are good for which applications . This is a representation of a single hard drive. Blocks DO, D1, D2 are blocks of data. When they are read from the hard drive they are read out in order. This form of data storage offers no fault tolerance. In other words if your hard drive dies in a fiery crash you will lose all the data on you hard drive. Since several independent sources estimate that the amount of data storage is increasing by 50 to 100% per year planning for disaster recovery and prevention is more important than ever.

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