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Chapter 6: 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.
RAID 10
Volume
Mirrored
Volume
Mirrored
Volume
Virtual
Volumes
Physical
Volumes
10029
Disk 2
S2 S3
S1 S4
S10 S11
S9 S12
S6 S7
S5 S8
S14 S15
S13 S16
S2 S3
S1 S4
S14 S15
S13 S16
S10 S11
S9 S12
S6 S7
S5 S8
Disk 3
S2 S3
S1 S4
S14 S15
S13 S16
S10 S11
S9 S12
S6 S7
S5 S8
Disk 1
S2 S3
S1 S4
Disk 4
S14 S15
S13 S16
S10 S11
S9 S12
S6 S7
S5 S8
B1 B2 B3 B4
B5 B6 B7 B8
B2 B4 B6 B8B1 B3 B5 B7
RAID 1 - Mirroring
RAID 0 - Striping
Figure 49. RAID 10 Volume Block Distribution