Raid Overview [zz]

RAID 0 refers to the disk Partitioning technology.
The implementation method is to segment data and write it to multiple disks at the same time. The advantage is that the disk can achieve parallel input and output, improving the disk read/write speed, but this technology is not fault tolerant;
Raid 1 refers to Disk Mirroring Technology
The implementation method is to simply copy data on a disk to a second disk or an equivalent storage device to achieve data redundancy, the advantage is that it achieves full data redundancy and excellent fault tolerance performance. However, this technology does not increase the disk read/write speed and cost;
Raid 2-5 is a technology that combines disk segments with Disk redundancy.
Raid 2 refers to disk segmentation combined with Hamm code Error Correction Technology
RAID 3 refers to the disk segment plus dedicated parity Disk
Raid 4 refers to the disk segment plus dedicated asynchronous parity Disk
RAID 5 refers to the dual verification of disks distributed in segments on each disk.
These technologies combine the advantages of the disk segmentation and Disk Mirroring technologies. These technologies require a disk array with at least three disks. The verification code technology is used for data redundancy, therefore, a disk failure is allowed, and the disk read/write capability is improved by using the disk segment technology. RAID 5 is currently the most widely used technology.

Raid Overview [zz]