Asus PCI-DA2100 User Manual - Page 11
Functional Description
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3 Chapter 3 Functional Description The advantages of RAID are: Availability, Capacity and Performance. Choosing the right RAID level and drive failure management can increase Availability, subsequently increasing Performance and Capacity. The ASUS PCI-DA2100/-DA2200 RAID controller provides complete RAID functionality and enhanced drive failure management. 3.1 RAID Management RAID stands for Redundant Array of Independent Drives. The advantages of using a RAID storage subsystem are: • Provides disk spanning by weaving all connected drives into one single volume. • Increases disk access speed by breaking data into several blocks when reading/writing to several drives in parallel. With RAID, storage speed increases as more drives are added. • Provides fault-tolerance by mirroring or parity operation. What are the RAID levels? RAID Description Level NRAID Non-RAID RAID 0 Disk Striping RAID 1 Mirroring Plus (0+1) Striping (if N>1) RAID 3 Striping with Parity on dedicated disk RAID 5 Striping with interspersed parity Minimum Drives 1 N N+1 N+1 N+1 Data Availability ==NRAID >>NRAID ==RAID 5 >>NRAID ==RAID 5 >>NRAID ==RAID 5 Performance Sequential Drive R: Highest W: Highest R: High W: Medium R: High W: Medium R: High W: Medium Performance Random Drive R: High W: Highest R: Medium W: Low R: Medium W: Low R: High W: Low ASUS PCI-DA2100/PCI-DA2200 User's Manual 11