SANRAD V-Switch manual Creating a RAID 10 and RAID 0+1, Volume Configuration 103

Creating a RAID 10 and RAID 0+1

You will need two separate commands to create a RAID 10 or 0+1 volume. RAID 10 first creates mirrored volumes and then creates a striped volume of the mirrored volumes. This gives the advantage of both high performance and data redundancy.

In Figure 49, page 104, in the first mirrored volume, data block 1 is mapped to both block 1 on Disk 1 and block 1 on Disk 2. Data blocks 3, 5 and 7 are mapped to blocks 2, 3 and 4 on both Disks 1 and 2.

In the second mirrored volume, data block 2 is mapped to both block 1 on Disk 3 and block 1 on Disk 4. Data blocks 4, 6 and 8 are mapped to blocks 2, 3 and 4 on Disks 3 and 4.

Data blocks 1 and 2 are then compiled in a striped pattern, along with blocks 3 – 8.

RAID 0+1 first creates striped volumes and then creates mirrored volumes of the striped volumes.

Virtual	RAID 10
	Volume
Volumes

B1	B2	B3	B4
B5	B6	B7	B8

Mirrored		Mirrored
Volume	RAID 0 - Striping	Volume

B1

B3 B5

B7

B2

B4 B6

B8

	RAID 1 - Mirroring
Disk 1	Disk 2	Disk 3	Disk 4

S1	S2	S3	S4	S1	S2	S3	S4
S5	S6	S7	S8	S5	S6	S7	S8
S9	S10	S11	S12	S9	S10	S11	S12
S13	S14	S15	S16	S13	S14	S15	S16

S1	S2	S3	S4	S1	S2	S3	S4
S5	S6	S7	S8	S5	S6	S7	S8
S9	S10	S11	S12	S9	S10	S11	S12
S13	S14	S15	S16	S13	S14	S15	S16

10029

Physical

Volumes

Figure 49. RAID 10 Volume Block Distribution

Chapter 6: Volume Configuration 103