Raid Arrays; Summary Of Raid Configurations - Foxconn NF4UK8AA series User Manual

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.

Summary of RAID Configurations

Advantages
Array
High data throughput.
RAID 0
1 0 0 %
RAID 1
redundancy.
Optimized for both
RAID
1 0 0 % d a t a r e d u n -
0+1
d a n c y
performance. Allows
spare disks.
Combines and uses
JBOD
the capacity of odd
size drives.
58
Chapter 5 NVIDIA RAID Introduction
NVIDIA RAID
Drawbacks
No fault tolerance.
Requires two drives
d a t a
for the storage space
of one drive.
Requires two drives
for the storage space
o f o n e d r i v e — t h e
a n d
same as RAID level 1.
D e c r e a s e s p e r f o r -
mance because of the
difficulty in using drives
concurrently or to op-
timize drives for differ-
ent uses.
# Hard Disks Fault Tolerance
multiple
2
4+
multiple
None
Yes
Yes
No