Appendix
65
Summary of RAID Configurations
RAID Arrays
This section describes the following types of RAID arrays that NVIDIA RAID
supports:
v
RAID 0
RAID 0 defines a disk striping scheme that improves the disk read and write
times for many applications.
v
RAID 1
RAID 1 defines techniques for mirroring data.
v
RAID 0+1
RAID 0+1 combines the techniques used in RAID 0 and RAID 1 arrays.
v
RAID 5
RAID 5 provides fault tolerance and better utilization of disk capacity.
v
Spanning (JBOD)
JBOD provides a method for combining drives of different sizes into one large
disk.
Array
RAID 0
RAID 1
RAID
0+1
RAID 5
JBOD
Advantages
High data throughput.
100% data redund-
ancy.
O pt imized f or bot h
10 0% d at a r edu n-
d a n c y a n d p e r -
f or m a n c e. A l l ow s
spare disks.
Fault tolerance and
better utilization of disk
space.
ombines and uses the
capacity of odd size
drives.
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.
Decreased write per-
formance due to parity
calculations.
D ec r eas es p er f or -
mance because of the
difficulty in using drives
concurrently or to op-
timize drives for differ-
ent uses.
# Hard Disks
multiple
2
4+
3+
multiple
Fault Tolerance
None
Yes
Yes
Yes
No
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