RAID 10 Example

Chapter 1: Introduction to the LSI MegaRAID Software Utility

RAID 10

RAID 10, a combination of RAID 1 and RAID 0, provides superb system performance and system security. RAID 10 mirrors small blocks of data to a series of RAID 1 drive groups. Then the first RAID 1 drive in a drive group duplicates its data to the second drive. RAID 10 requires a minimum of 4 drives. Any additional drives must be be added in pairs (6 drives, 8 drives, etc). The following illustration provides a visual example of a RAID 10 virtual drive group.

RAID 10

RAID 0

	RAID 1		RAID 1
Drive A	Drive B	Drive C	Drive D
Segment 1	Segment 1	Segment 2	Segment 2
	Duplicate		Duplicate
Segment 3	Segment 3	Segment 4	Segment 4
	Duplicate		Duplicate

RAID 5

RAID 5 provides high data throughput by implementing block-level striping with par- ity data distributed across all drives. A RAID 5 configuration can survive the loss of a single drive failure because the parity drive can be used to re-create the missing data. RAID 5 requires at least 3 drives. The following illustration provides a visual example of a RAID 5 virtual drive group with three drives.

RAID 5

Drive A	Drive B	Drive C
Segment 1	Segment 2	Parity (1,2)
Segment 3	Parity (3,4)	Segment 4
Parity (5,6)	Segment 5	Segment 6

RAID 5 Example

1-5