American Megatrends MegaRAID Express 500 사용자 설명서
Chapter 5 Configuring MegaRAID Express 500
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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.
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.
OEM level firmware that can span up to 4 logical drives is assumed.
RAID
Level
Description
Drives
Required
Capacity
0
Striping
without parity
1 – 32
(Number of disks) X capacity of
smallest disk
1
Mirroring
2
(Capacity of smallest disk) X (1)
3
Striping with
fixed parity
drive
3 – 8
(Number of disks) X (capacity of
smallest disk) - (capacity of 1 disk)
5
Striping with
floating parity
drive
3 – 8
(Number of disks) X (capacity of
smallest disk) - (capacity of 1 disk)
10
Mirroring and
Striping
4 – 8 (Must
be a multiple
of 2)
(Number of disks) X (capacity of
smallest disk) / (2)
30
RAID 3 and
Striping
6 – 32 (Must
be a multiple
be a multiple
of arrays)
(Number of disks) X (capacity of
smallest disk) – (capacity of 1 disk X
number of Arrays)
50
RAID 5 and
Striping
6 – 32 (Must
be a multiple
be a multiple
of arrays)
(Number of disks) X (capacity of
smallest disk) – (capacity of 1 disk X
number of Arrays)
Note:
The maximum number of physical drives supported per controller is 15.
Cont’d