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RAID Levels 45
RAID 1
In RAID 1, the RAID controller duplicates all data from one drive to a
second drive. RAID 1 provides complete data redundancy, but at the cost of
doubling the required data storage capacity, as shown in Figure 3-2. Table 3-
3 provides an overview of RAID 1.
Table 3-3. RAID 1 Overview
Uses
Use RAID 1 for small databases or any other
environment that requires fault tolerance but small
capacity.
Strong Points
RAID 1 provides complete data redundancy. RAID 1 is
ideal for any application that requires fault tolerance
and minimal capacity.
Weak Points
RAID 1 requires twice as many disk drives.
Performance is impaired during drive rebuilds.
Drives 2