Appendix B: Understanding RAID
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RAID 10 Arrays
A RAID 10 array is built from two or more equal-sized RAID 1 arrays.
Adaptec RAID controllers support a maximum number of 48 disk
drives in a RAID 10 array.
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 below.
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
250 GB
250 GB
400 GB
400 GB
Disk Drives in Logical Drive
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
RAID 10 Logical Drive = 500 GB
1
2
1
2
Not Used
Not Used
3
4
3
4
500
499
500
499
...
...
...
...
Unused Space: 150 GB
Unused Space: 150 GB
Drive Segment Size (Smallest Disk Drive)
