What volume is also called raid-5?

RAID is also called a physical volume. (Recommended Learning: PHPSTORM )

## In the RAID-5 volume, Windows 2003 by adding a puppet verification information belt area to each hard disk partition of the volume to achieve fault tolerance.

If a hard drive fails, Windows 2003 can use the data and parity information on the remaining hard drives to reconstruct the data on the failed hard drive.

Due to the need to calculate parity information, write operations on RAID-5 volumes are slower than write operations on mirrored volumes.

However, RAID-5 volumes provide better read performance than mirrored volumes. The reason is simple, Windows 2003 can read data from multiple disks simultaneously.

Compared with mirrored volumes, RAID-5 volumes are more cost-effective, and the more hard drives in a RAID-5 volume, the lower the cost of redundant data strips.

But RAID-5 volumes also have some limitations. First, a RAID-5 volume requires at least 3 hard disks to implement, but cannot exceed 32 hard disks at most; second, a RAID-5 volume cannot contain the root partition or system partition.

Advantages of RAID-5 volumes

RAID-5 volumes are suitable for large-scale serialized read and write operations. RAID-5 volumes are suitable for use in the following situations:

口 Read operations are more frequent than write operations in large databases. Performance decreases as the percentage of write operations increases. Random-read database applications will run better with load balancing installed on RAID-5 volumes.

port When a high degree of fault tolerance is required, but the cost of mirroring volumes cannot be incurred. When using a large number of disks, raid-5 is significantly more efficient than mirrored volumes. The space required to store parity information is equal to 1/N (N is the number of disks). Therefore, 10 disk arrays use 1/10 of the space to store parity information.

As the number of disks in the array increases, the utilization rate also increases.

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