Intel SRCU31 user manual 5.2.9.4RAID Level 10 Example, Disk #0, Disk #1, RAID Features

RAID Features

Figure 5-4. Data Map of a RAID Level 1 Volume, Volume on 2 Disks with Mirroring

Disk #0	Disk #1
		Vol 1
D2	D2	Vol 0
D1	D1
D0	D0

Data Map of a RAID Level 1 Volume

Di is the i'th data strip

5.2.9.4RAID Level 10 Example

This RAID level is not user selectable. In arrays with more than 2 disks (see Figure 5-5and Figure 5-6) a RAID 1 volume stills write each data element twice, but it utilizes all the disks in the array. Some vendors refer to this as RAID 10 or 0+1, since it is a combination of RAID 0 and 1. This increases performance by spreading the load across all the disks. In addition to good performance, this type of array also provides high reliability but its usable capacity is one half of its physical capacity. In the event one disk fails, data integrity is maintained.

Figure 5-5. Data Map of a RAID Level 10 Volume with 3 Disks, Showing the First 4 Stripes - Striping with Mirroring with Three Disks

Disk #0 Disk #1 Disk #2

D4	D5	D5
D3	D3	D4
D1	D2	D2
D0	D0	D1

Data Map of a RAID Level 10 Volume

Di is the i'th data strip

Vol 1

Vol 0

5-16 Intel® Server RAID Controller U3-1 User’s Manual Rev 1.0