User Guide

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4-38 Selecting a RAID Level
Marvell RAID Utility User Guide
4.3 RAID 10 (Mirroring and Striping)
RAID 10 is a combination of the mirroring (RAID 1) and striping (RAID 0) techniques. At least
four physical disks (two pairs) are needed to configure a RAID 10 logical drive. Both pairs of
physical disks make separate RAID 0 stripes, and then the first RAID 0 drive is mirrored to
the second RAID 0 drive. See Figure 4-3 for more detail.
RAID 10 provides the read and write performance of RAID 0, while providing the redundancy
protection of RAID 1.
Also, in the event of a disk failure, the logical drive can rebuild itself while the system
continues to function normally.
Figure 4-3 RAID 10: Mirroring and Striping
Note: Like RAID 1, RAID 10 uses the mirroring technique for redundancy, so it is important to
remember that, for example, two 80 Gb physical disks (a total of 160 Gb) would only store 80 Gb of
original data because the remaining 80 Gb is required to mirror the original data.
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
Block 7
Block 8
Block 1
Block 3
Block 5
Block 7
Block 2
Block 4
Block 6
Block 8
Logical Drive
Physical Disk 1 Physical Disk 2
Striping
Block 1
Block 3
Block 5
Block 7
Block 2
Block 4
Block 6
Block 8
Physical Disk 3 Physical Disk 4
Striping
Mirroring
=