Sonnet Technologies Fusion R400S RAID (Without Drives) - Manual (Page 5)

3
Drive Mode Descriptions
The following two pages describe the various drive modes
supported by the R400S RAID. To configure the Fusion
R400S RAID’s drives, refer to Select Drive Mode on page 5.
RAID 0: Striping, No Redundancy
RAID 0 (striping) is based on the fact that increased
performance can be achieved by simultaneously accessing
data across multiple drives, increasing data transfer rates
while reducing average access time by overlapping drive
seeks. Drives are accessed alternately, as if stacked one on
top of the other.
RAID 0 provides no data protection, but
offers the full capacity of the drives. If one drive fails, all
data within that stripe set is lost. See Figure 5.
RAID 0 is used by applications requiring high performance
for non-critical data.
RAID 10: Striping, Mirror Spans Two Drives
RAID 10 increases data transfer rates while ensuring security
by writing the exact same data simultaneously to two
or more different drives. RAID 10 is used in applications
requiring higher performance and redundancy, combining
the attributes of RAID Levels 1 and 0. See
Figure 6.
RAID 10 offer 50% of the total capacity of the four drives.
Span: Concatenation, Volume Spans Four Drives
Span mode creates a single, large volume that spans all four
drives, writing files to the capacity of the first drive, then the
second drive, and so on. See
Figure 7. Span mode provides
no data protection.
Span formatting offers the full capacity of the four drives.
Disk 1
Stripe 1
Stripe 2
Stripe 3
Disk 2 Disk 3 Disk 4
RAID 0: Striping, No Redundancy
Figure 5
Disk 1
Data 1
Data 3
Data 5
Data 1
Data 3
Data 5
Stripe 1
Stripe 2
Stripe 3
Disk 2
Data 1
Data 3
Data 5
Data 2
Disk 3
Data 4
Data 6
Data 2
Data 4
Data 6
Disk 4
Data 2
Data 4
Data 6
RAID 10:
Striping, Mirror Spans Two Drives
Figure 6
Disk 1
Data 1
Data 2
Data 3
Data 4
Disk 2
Data 25
Data 26
Data 27
Data 28
Disk 3
Data 49
Data 50
Data 51
Data 52
Disk 4
Data 73
Data 74
Data 75
Data 76
Span (Concatenation, Big)
Figure 7
WARNING: RAID 5 and 10 formatting improves
data accessibility and reliability during normal
operations, however, you still need a good backup strategy
for long-term protection of your data.