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Figure 3. RAID 1 Drive Group
RAID 1E
RAID 1E, Integrated Mirroring Enhanced, combines mirroring and data striping. Each mirrored stripe is written to a
disk and mirrored to an adjacent disk.
RAID 1E has a profile similar to that of RAID 1. Any RAID 1 drive group with more than two drives is a RAID 1E
drive group. Table 3 provides an overview of RAID 1. Figure 4 shows an example of RAID 1 use.
RAID 1E provides data redundancy and high levels of performance and allows a larger number of physical drives
to be used. RAID 1E requires a minimum of three drives and supports a maximum of 32 drives.
Table 3. RAID 1E
Good for small databases or any other environment that requires fault tolerance
Provides complete data redundancy and high performance
Requires twice as many drives. Allows only 50 percent of the physical drive storage capacity
to be used
4 through 32 (must be an even number of drives)
Figure 4. RAID 1E Drive Group 1
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