Raid 10 Arrays - Adaptec SAS/SATA/SCSI RAID Controllers Installation And 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
Disk Drive 2
Disk Drive 3
Disk Drive 4
Disk Drives in Logical Drive
Drive Segment Size
250 GB
(Smallest Disk Drive)
250 GB
Disk Drive 1
Disk Drive 2
400 GB
Disk Drive 3
Disk Drive 4
400 GB
Appendix B: Understanding RAID
1 3 ... 499
2 4 ... 500
1 3 ... 499
Unused Space = 150 GB
2 4 ... 500
Unused Space = 150 GB
RAID 10 Logical Drive = 500 GB
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