Introduction to RAID : RAID Levels : RAID 1

RAID 1

In RAID 1, the Nytro MegaRAID controller duplicates all data from one drive to a second drive in the drive group. RAID 1 supports an even number of drives from 2 through 32 in a single span. RAID 1 provides complete data redundancy, but at the cost of doubling the required data storage capacity. The following table provides an overview of RAID 1. The following figure provides a graphic example of a RAID 1 drive group.

Table 8. RAID 1 Overview

Uses

Use RAID 1 for small databases or any other environment that requires fault tolerance but small capacity.

Strong points

Provides complete data redundancy. RAID 1 is ideal for any application that requires fault tolerance and minimal capacity.

Weak points

Requires twice as many drives. Performance is impaired during drive rebuilds.

Drives

2 through 32 (must be an even number of drives)

Figure 12. RAID 1 Drive Group