Adaptec 2020SA User Guide - Page 145
Spanned Volume, RAID0, RAID1
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About RAID Spanned Volume A spanned volume is created by joining, or concatenating, two or more drives. The drives do not have to be of equal capacity and are connected end-to-end. A spanned volume offers no redundancy and no performance advantage over a single drive. RAID 0 A RAID 0 is created by striping data across two or more drives. This striping scheme creates no redundancy to protect the data. However, because the drives share load equally, RAID 0 provides the best read and write performance of any RAID type. An example of a RAID 0 array is shown below. RAID 0 Drive Data 0 Data 2 Data 4 Data 6 Drive Data 1 Data 3 Data 5 Data 7 RAID 1 A RAID 1 array is created by copying, or mirroring, all data from one drive onto a second drive. This mirroring provides redundancy, ensuring that if one drive fails no data is lost. Redundancy also means that only half of the total capacity is available. E-2