Raid 10 Arrays - Adaptec ASR-6805Q User Manual

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 figure.
Disk Drive 1 250 GB
Disk Drive 2 250 GB
Disk Drive 3 400 GB
Disk Drive 4 400 GB
Disk Drives in Logical Drive
Proprietary and Confidential to PMC-Sierra, Inc.
Document No.: CDP-00277-02-A Rev. A, Issue:
Serial Attached SCSI RAID Controllers Installation and User's Guide
Drive Segment Size
(Smallest Disk Drive)
Disk Drive 1 1 3 . . .
Disk Drive 2 2 4 . . .
Disk Drive 3
1 3 . . .
Disk Drive 4 2 4 . . .
RAID 10 Logical Drive = 500 GB
499
500
499
Unused Space = 150 GB
500
Unused Space = 150 GB
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