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Intel® Server RAID Controller U3-1 User’s Manual Rev 1.0 5-15
RAID Features
Strip size is specified when you create a RAID volume. Strip size options for RAID levels 0, 1, 5,
and 10 are specified below.
5.2.9.2 RAID Level 0 Example
Data on a RAID 0 volume is striped across all of its member disks. The strip size is the amount of
logically contiguous data striped on each disk. Since data is spread across several physical disks,
accesses tend to be evenly distributed across all the disks. This sharing of the workload increases
the throughput when compared to a single physical disk. There is neither parity nor mirroring, so a
RAID 0 volume will lose data if one of its member disks fails.
Figure 5-3. Data Map of a RAID Level 0 Volume with 4 Disks, Showing the First 5 Stripes
5.2.9.3 RAID Level 1 Example
ARAID1volumemirrors the same data on two of its members. This type of array gives good
performance and high reliability but its usable capacity is one half of its physical capacity. See
Figure 5-4. In a two disk RAID 1 volume, each disk has an identical copy of the data. In the event
a disk fails, data integrity is maintained.
Table 5-14. Strip Size Availability and RAID Level
RAID Level
Strip Size
4K 8K 16K 32K 64K 128K
RAID0
(with < 2 drives RAID 10)
XXXXXX
RAID1 XXXXXX
RAID5 XXXX
Disk #0 Disk #1 Disk #2 Disk #3
Vol 1
Vol 0
Data Map of a RAID Level 0 Volume
D16
D12
D8
D4
D0
Di is the i'th data strip
D17
D13
D9
D5
D1
D18
D14
D10
D6
D2
D19
D15
D11
D7
D3