3Ware 9550SXU-16ML User Guide - Page 17
RAID 10, RAID 10 Configuration Example - 12
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Understanding RAID Concepts and Levels RAID 10 This array is a combination of RAID 1 with RAID 0. Striped and mirrored arrays for fault tolerance and high performance. Requires a minimum of four drives to use both RAID 0 and RAID 1 techniques. When drives are configured as a striped mirrored array, the disks are configured using both RAID 0 and RAID 1 techniques, thus the name RAID 10 (see Figure 4). A minimum of four drives are required to use this technique. The first two drives are mirrored as a fault tolerant array using RAID 1. The third and fourth drives are mirrored as a second fault tolerant array using RAID 1. The two mirrored arrays are then grouped as a striped RAID 0 array using a two tier structure. Higher data transfer rates are achieved by leveraging TwinStor and striping the arrays. In addition, RAID 10 arrays offer a higher degree of fault tolerance than other types of RAID levels (such as RAID 1 and RAID 5), since the array can sustain multiple drive failures without data loss. For example, in a twelve drive RAID 10 array, up to six drives can fail (half of each mirrored pair) and the array will continue to function. Please note that if both halves of a mirrored pair in the RAID 10 array fail, then all of the data will be lost. Figure 4. RAID 10 Configuration Example RAID 50 This array is a combination of RAID 5 with RAID 0. This array type provides fault tolerance and high performance. Requires a minimum of six drives. Several combinations are available with RAID 50. For example, on a 12-port controller, you can have a grouping of 3, 4, or 6 drives. A grouping of 3 means that the RAID 5 arrays used have 3 disks each; four of these 3-drive RAID 5 arrays are striped together to form the 12-drive RAID 50 array. In addition, RAID 50 arrays offer a higher degree of fault tolerance than other types of RAID levels (such as RAID 1 and RAID 5), since the array can sustain multiple drive failures without data loss. For example, in a twelve drive RAID 50 array, up to one drive in each RAID 5 set can fail and the array will continue to function. Please note that if two or more drives in a RAID 5 set fail, then all of the data will be lost. www.3ware.com 7