Redundant Array of Independent Disks (RAID)

Paper Summary:

This paper examines how Redundant Array of Independent Disks (RAID) describes array configuration and applications for multiple, inexpensive hard disks, providing fault tolerance (redundancy) and improved access rates (RAID concept). RAID provides a way to access multiple individual disks as if the array were one larger disk, spreading data access out over these multiple disks, reducing the risk of losing all data if one drive fails, and improving access time. It looks at how RAID is commonly used in large file servers, transaction of application servers, where data accessibility is critical and fault tolerance is required, and explores ten types of RAID, presenting a myriad of feature trade-offs that must be appropriately mapped to critical implementation requirements.

From the Paper:

"RAID 1 allows two or more disks to mirror each other (Achieving fault tolerance by using RAID). This configuration produces slow writes, but relatively quick reads, and facilitates high data availability on servers because a single disk can be lost without any loss of data. When more than two disks make up the mirror, the RAID 1 array can lose multiple disks as long as a complete mirrored pair is not lost. On the downside, the amount of physical disk space required is twice the space required to store the data. Therefore, Level 1 is most often used for applications that require very high data availability."

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