Raid 5 With Three Hard Drives - Compaq dc7800 - Convertible Minitower PC User Manual

Advanced host controller interface (ahci) and redundant array of independent disks (raid) using intel matrix storage manager

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Figure 3

Reliability: RAID 1 - Mirroring

RAID 5 with three hard drives

RAID 5 has been used in servers for many years and is one of the most common types of RAID. RAID 5

uses striping with parity data in distributed blocks across all member disks. Therefore, the mass storage

controller can simultaneously write new information to two hard drives and parity information to the third

hard drive, so if one hard drive fails, the RAID controller can rebuild all the information after the volume

degradation occurred. Hence, RAID 5 with three hard drives has similar performance to RAID 0 with two

hard drives, and the reliability of RAID 1 with a minimum of three hard drives.

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