|
RAID Levels, summary
| Level
|
Number of
Disks
|
Size of
Disks
|
Total
Size
|
Redundant
Disks
|
Performance |
| Read
|
Write
|
| Linear
|
N>1
|
S0,
S1 ... SN
|
S0+
S1+ ... + SN |
0
|
as one disk
|
| RAID-0
|
N>1
|
S0=S1=...=
SN=S
|
N*S
|
0
|
best
|
| RAID-1
|
N>1
|
S0=S1=...=
SN=S |
S
|
N-1
|
good
|
as
worst disk
|
| RAID-4
|
N>2
|
S0=S1=...=
SN=S |
(N-1)*S
|
1
|
as
RAID-0
|
bad
|
| RAID-5
|
N>2
|
S0=S1=...=
SN=S |
(N-1)*S
|
1
|
worse
than
RAID-4
|
as
RAID-1
|
|