System information

Appendix
A-10
A.10 RAID 60
RAID 60 arrays are formed by striping data across RAID 6 sub-arrays. Striping increases the system capacity and
performance without adding disks to the array. It features dual parity, which allows for a possible failure of two disks in
each array.
RAID 60: Striping with dual parity
Characteristics
• Storage capacity = [(number of disks in each subarray) -1] x (number of subarrays) x (capacity of the
smallest disk)
• A minimum of eight disks are required.
• More fault tolerant than RAID 5
• Dual parity allows two disk failures in each array.
• Increased capacity and performance thanks to striping.
Recommended use
• Data archiving/ backing up
• High availability applications
• Large capacity servers
Striping
A
E
P
5
P7
C
P
3
P6
M
P1
P4
I
O
P2
G
K
P
8
RAID 6
B
F
P
13
P15
D
P
11
P14
N
P9
P12
J
Q
P10
H
L
P
16
RAID 6
AC
EG
IK
MO
BD
FH
JL
NQ
E
F
Logical Volume
A . . . Q
Figure A-9 RAID 60 disk array