User`s guide

Chapter 6. Configuring Your Array
EK–SWRA2–IG. C01 6–29
Table 6–3 Number of Drives You Can Use In a Drive Group for Each RAID
Level
RAID
Level
Number of Drives
in Drive Group
Amount of Storage
Available for Unique
Data
Data
Redundancy
0 2 to 8
100%
No
12
50%
Yes
0 + 1 3 to 8
50%
Yes
5 3 to 8
66%

87%
Yes
JBOD 1
100%
No
NOTE
The following equation determines the amount
of storage available for unique information in a
RAID 5 logical RAID drive.
usable space = total space
*
((N-1)/N) where
N is the number of drives in the drive group.
Table 6–4 How the Capacity of Each Individual Drive Affects the Capacity of
the Drive Group – – Example Only
Drive
Group
Drives Drive's
Capacity
Drive's Usable
Capacity in this
Group
Drive Group's
Total Capacity
A0
1
2
1 gigabyte
2 gigabyte
2 gigabyte
1 gigabyte
1 gigabyte
1 gigabyte
3 gigabytes
(due to drive 0's
capacity being
1 gigabyte)
B0
1
2
2 gigabytes
2 gigabytes
2 gigabytes
2 gigabytes
2 gigabytes
2 gigabytes
6 gigabytes