Compaq Infortrend manual LogicalDrive

configure a logical volume. There are more combinations than RAID 10, 30, and 50.

RAID Level	Performance Sequential	Performance Random
NRAID	Drive	Drive
RAID 0	R: Highest	R: High
	W: Highest	W: Highest
RAID 1 (0+1)	R: High	R: Medium
	W: Medium	W: Low
RAID 3	R: High	R: Medium
	W: Medium	W: Low
RAID 5	R: High	R: High
	W: Medium	W: Low

NRAID

Disk Spanning

Figure 1 - 2 NRAID

2 G B H a r d D r i v e

+

3 G B H a r d D r i v e

+

1 G B H a r d D r i v e

+

2 G B H a r d D r i v e

Logical	2 +	3 + 1 +	2 = 8	G B
Drive		L o g i c a l	D r i v e

NRAID

Minimum	1
Disks required
Capacity	N
Redundancy	No

NRAID stands for Non-RAID. The capacity of all the drives is combined to become one logical drive (no block striping). In other words, the capacity of the logical drive is the total capacity of the physical drives. NRAID does not provide data redundancy.

JBOD

Single Drive Control

Figure 1 - 3 JBOD

2 GB =	2 GB Har d Drive
LogicalDrive

3 GB = 3 GB Har d Drive

LogicalDrive

1	GB =	1 GB Har d Drive
LogicalDrive
2	GB =	2 GB Har d Drive
LogicalDrive

JBOD

Minimum	1
Disks required
Capacity	1
Redundancy	No

JBOD stands for Just a Bunch of Drives. The controller treats each drive as a stand-alone disk, therefore each drive is an independent logical drive. JBOD does not provide data redundancy.

Functional Description 1-3