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RAID 10 Arrays

A RAID 10 array is built from two or more equal-sized RAID 1 arrays. Data in a RAID 10 array 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 array. For instance, an array

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 array, as shown in this gure.

Unused Space = 150 GB

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

Unused Space = 150 GB

Disk Drives in Logical Drive

RAID 10 Logical Drive = 500 GB

4991 3 . . .

5002 4 . . .

4991 3 . . .

5002 4 . . .

76Proprietary and Condential to PMC-Sierra, Inc.

Document No.: CDP-00277-02-A Rev. A, Issue:

Serial Attached SCSI RAID Controllers Installation and User's Guide

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