User`s guide

Appendix B: Selecting the Best RAID Level ● 157

RAID 10 Logical Drives

A RAID 10 logical drive is built from two or more equal-sized RAID 1 logical drives. Data in a

RAID 10 logical drive is both striped and mirrored. Mirroring provides data protection, and

striping improves performance.

Drive segment size is limited to the size of the smallest disk drive in the logical drive. For

instance, a logical drive with two 250 GB disk drives and two 400 GB disk drives can create two

mirrored drive segments of 250 GB, for a total of 500 GB for the logical drive, as shown in this

figure.

Disk Drive 1

Disk Drive 2

Disk Drive 3

Disk Drive 4

250 GB

400 GB

Drive Segment Size (Smallest Disk Drive)

Disk Drive 2

Disk Drive 3

Disk Drive 4

Disk Drive 1

13...499

2 4 ... 500

1 3 ... 499

2 4 ... 500

Unused Space = 150 GB

Disk Drives in Logical Drive RAID 10 Logical Drive = 500 GB

Unused Space = 150 GB