Foxconn NF4SLI7AA-8EKRS2 Raid manual - Manual (Page 3)

1
Summary of RAID Configurations
RAID Arrays
This section describes the following types of RAID arrays that NVIDIA RAID
supports:
• RAID 0
RAID 0 defines a disk striping scheme that improves the disk read and write
times for many applications.
• RAID 1
RAID 1 defines techniques for mirroring data.
• RAID 0+1
RAID 0+1 combines the techniques used in RAID 0 and RAID 1 arrays.
• Spanning (JBOD)
JBOD provides a method for combining drives of different sizes into one large
disk.
• RAID 5
RAID 5 stripes both data and parity information across three or more drives.
Array
RAID 0
RAID 1
RAID
0+1
JBOD
RAID 5
NVIDIA RAID
Advantages
High data throughput.
100% data
redundancy.
Optimized for both
100% data redun-
dancy and
performance. Allows
spare disks.
Combines and uses
the capacity of odd
size drives.
Fault tolerance and
better utilization of
disk space.
Drawbacks
No fault tolerance.
Requires two drives for
the storage space
of one drive.
Requires two drives for
the storage space
of one drive—the same
as RAID level 1.
Decreases performance
because of the difficulty
in using drives
concurrently or to opti-
mize drives for different
uses.
Decreased write perfor-
manc e due t o par it y
calculations.Requires at
reast three drives.
# Hard Disks
multiple
2
4+
multiple
3+
Fault Tolerance
No
Yes
Yes
No
Yes
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