APC RAID Subsystem SCSI-SATA II Informations techniques Page 179

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Appendix
A-7
A.7 RAID 10
RAID 10 arrays are formed by striping data across RAID 1 sub-arrays. This offers better performance than RAID 1 alone
but does not have the speed of a pure RAID 0 array. Storage efficiency and fault tolerance vary depending on the number
and size of sub-arrays compared to the array as a whole.
RAID 10: High reliability setup combined with high performance
Characteristics
Storage capacity = (number of disks/ 2) x (capacity of the smallest disk)
A minimum of four disks are required.
Same fault tolerance as RAID 1
I/O rates are high thanks to striping RAID 1 segments
Can handle multiple simultaneous disk failures
Recommended use
High performance database servers
A
CONTROLLER
B
C
G
F
D
E
RAID 1
B
D
F
H
B
D
F
H
RAID 1
A
C
E
G
A
C
E
G
=
Figure A-6 RAID 10 disk array
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