Foxconn N570SM2AA user manual Nvidiaraid, Array Advantages Drawbacks # Hard Disks Fault Tolerance

Appendix

NVIDIARAID

RAID Arrays

This section describes the following types of RAID arrays that NVIDIA RAID supports:

vRAID 0

RAID 0 defines a disk striping scheme that improves the disk read and write times for many applications.

vRAID 1

RAID 1 defines techniques for mirroring data. vRAID 0+1

RAID 0+1 combines the techniques used in RAID 0 and RAID 1 arrays. vRAID 5

RAID 5 provides fault tolerance and better utilization of disk capacity. vSpanning (JBOD)

JBOD provides a method for combining drives of different sizes into one large disk.

Summary of RAID Configurations

Array Advantages Drawbacks # Hard Disks Fault Tolerance

RAID 0 High data throughput.					No fault tolerance.
RAID 1 100% data			redund-		Requires two drives
	ancy.				for the storage space
					of one drive.
RAID	Optimized		for both		Requires two drives
0+1	100%	data		redun-	for the storage space
	d a n c y	a n d		p e r -	of one drive - the same
	f or manc e.		A ll ows		as RAID level 1.
	spare disks.
RAID 5 Fault tolerance and					Decreased write per-
	better utilization of disk				formance due to parity
	space.				calculations.
JBOD	ombines and uses the				Dec reas es perfor -
	capacity of odd size				mance because of the
	drives.				difficulty in using drives
					concurrently or to op-
					timize drives for differ-
					ent uses.

multiple	None
2	Yes
4+	Yes

3+ Yes

multiple No

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