Asus PCI-DA2100 User Manual - Page 404
Raid 3
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ASUS GUI RAID Manager: RAID Levels Logical Drive Block 1 Block 2 Block 3 Block 4 Block 5 Block 6 Block 7 Block 8 . . Physical Disks Striping Block 1 Block 2 Block 3 Block 4 Block 5 Block 6 Block 7 . . Block 8 . . Mirror Mirror 1 Mirror 2 Mirror 3 Mirror 4 Mirror 5 Mirror 6 Mirror 7 Mirror 8 . Striping . . . RAID 3 RAID 3 implements block striping with dedicated parity. This RAID level breaks data into logical blocks, the size of a SCSI disk block, and then stripes these blocks across several drives. One drive is dedicated to parity. In the event a disk fails, the original data can be reconstructed from the parity information. In RAID 3, the total disk capacity is equivalent to the sum of the capacities of all SCSI drives in the combination, excluding the parity drive. Thus, combining four 1GB SCSI drives, for example, would create a single logical drive with a total disk capacity of 3GB. This combination appears to the system as a single logical drive. RAID 3 provides increased data transfer rates when data is being accessed in large chunks or sequentially. However, in write operations that do not span multiple drives, performance is reduced since the information stored in the parity drive needs to be re-calculated and re-written every time new data is written to any of the data disks. RAID 3 C-5