Foxconn Q67M-S English Manual - Page 77

5 RAID 0 (Stripe) RAID 0 reads and writes sectors of data interleaved among multiple drives. If any disk member fails, it affects the entire array. The disk array data capacity is equal to the number of drive members times the capacity of the smallest member. The striping block size can be set from 4KB to 128KB. RAID 0 does not support fault tolerance. RAID 1 (Mirror) RAID 1 writes duplicate data onto a pair of drives and reads both sets of data in parallel. If one of the mirrored drives suffers a mechanical failure or does not respond, the remaining drive will continue to function. Due to redundancy, the drive capacity of the array is the capacity of the smallest drive. Under a RAID 1 setup, an extra drive called the "spare drive" can be attached. Such a drive will be activated to replace a failed drive that is part of a mirrored array. Due to the fault tolerance, if any RAID 1 drive fails, data access will not be affected as long as there are other working drives in the array. RAID 5 (Parity) RAID 5 provides data striping at the byte level and also stripes error correction information. This results in excellent performance and good fault tolerance. Level 5 is one of the most popular implementations of RAID. RAID 10 (0+1) RAID 10 is a combination of striping and mirroring. This configuration provides optimal speed and reliability, but you need four SATA hard disks. Comparison Table : Solution RAID0 RAID1 RAID5 RAID10 Hard Disks No. >=2 2 >=3 Capacity All 50% N-1 >=4 Smallest (Even number) *2 Performance Highest Read faster Read faster Write slower High Reliability Dangerous Excellent Good Application Look for speed 100% Data backup Limited budget Excellent Unlimited budget 70