Raid 0; Raid 1; Raid (0+1); Figure 1 - 4 Raid 0 - Compaq External RAID Controller & Subsystem Infortrend Operation Manual

RAID 0

Disk Striping

Figure 1 - 4 RAID 0

L ogicalD rive
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
Block 7
Block 8

RAID 1

Disk Mirroring

Figure 1 - 5 RAID 1

L o g i c a l D r i v e
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
Block 7
Block 8

RAID (0+1)

Disk Striping with Mirroring

Figure 1 - 6 RAID (0+1)

Logical Drive
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
Block 7
Block 8
.
.
1-4
PhysicalD isks
Striping
Block 1 Block 2
Block 3 Block 4
Block 5 Block 6
Block 7 Block 8
P h y s i c a l D i s k s
M irroring
Block 1 Mirror 1
Block 2 Mirror 2
Block 3 Mirror 3
Block 4 Mirror 4
Physical Disks
Striping
Block 1 Block 2
Block 3 Block 4
Block 5 Block 6
Block 7 Block 8
.
.
.
.
Mirror 1 Mirror 2
Mirror 3 Mirror 4
Mirror 5 Mirror 6
Mirror 7 Mirror 8
Striping
.
.
.
.
RAID 0
Minimum
Disks required
Capacity
Redundancy
RAID 0 provides the highest performance
but no redundancy.
drive is striped (distributed) across several
physical drives.
RAID 1
Disks required
Capacity
Redundancy
RAID 1 mirrors the data stored in one
hard drive to another. RAID 1 can only
be performed with two hard drives. If
there are more than two hard drives,
RAID (0+1)
automatically.
RAID (0+1)
Minimum
Disks required
Capacity
Redundancy
RAID (0+1) combines RAID 0 and RAID 1 -
Mirroring and Striping. RAID (0+1) allows
multiple drive failure because of the full
redundancy of the hard drives. If there are
more than two hard drives assigned to
perform RAID 1, RAID (0+1) will be
automatically applied.
2
N
No
Data in the logical
2
N/2
Yes
will be performed
4
N/2
Yes
Infortrend