Configuration Strategies - LSI MegaRAID Enterprise 1600 Hardware Manual

Configuration Strategies

The most important factors in RAID array configuration are: drive capacity, drive availability
(fault tolerance), and drive performance. You cannot configure a logical drive that optimizes all
three factors, but it is easy to choose a logical drive configuration that maximizes one factor at the
expense of the other two factors, although needs are seldom that simple.
Maximize Capacity RAID 0 achieves maximum drive capacity, but does not provide data redundancy. Maximum
drive capacity for each RAID level is shown below. OEM level firmware that can span up to 4
logical drives is assumed.
RAID
Level
0
1
3
5
10
30
50
40 MegaRAID Enterprise 1600 Hardware Guide
Description Drives
Required
Striping 1 – 32
without parity
Mirroring 2
Striping with 3 – 32
fixed parity
drive
Striping with 3 – 32
floating parity
drive
Mirroring and 4 – 32 (Must
Striping be a multiple
of 2)
RAID 3 and 6 – 32 (Must
Striping be a multiple
of arrays)
RAID 5 and 6 – 32 (Must
Striping be a multiple
of arrays)
Capacity
(Number of disks) X capacity of
smallest disk
(Capacity of smallest disk) X (1)
(Number of disks) X (capacity of
smallest disk) - (capacity of 1 disk)
(Number of disks) X (capacity of
smallest disk) - (capacity of 1 disk)
(Number of disks) X (capacity of
smallest disk) / (2)
(Number of disks) X (capacity of
smallest disk) – (capacity of 1 disk X
number of Arrays)
(Number of disks) X (capacity of
smallest disk) – (capacity of 1 disk X
number of Arrays)
Cont'd