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Chapter 4: Overview of Integrated Striping | Integrated Striping Description SAS2 Integrated RAID Solution User Guide
Page 24 LSI Corporation Confidential
| August 2010
4.3 Integrated Striping
Description
On Integrated Striping volumes, the firmware writes data across multiple disks instead
of onto one disk. It does this by partitioning each disk’s storage space into 64-KB
stripes. The firmware interleaves the stripes round-robin so that the combined storage
space consists alternately of stripes from each disk.
The following figure shows an example of integrated striping: the firmware writes
segment 1 to disk 1, segment 2 to disk 2, segment 3 to disk 3, and so on. When the
firmware reaches the end of the disk list, it continues writing data at the next available
segment of disk 1.
Figure 8: Integrated Striping Example
The following figure shows a logical view and a physical view of an Integrated Striping
volume with three disks.
Figure 9: Integrated Striping – Logical and Physical Views
Speed is the primary advantage of the Integrated Striping solution because it transfers
data to or from multiple disks simultaneously. However, there is no data redundancy.
Back the data up on other media to avoid losing unsaved data if one disk fails.
Disk 2
Segment 2
Segment 6
Segment 10
Disk 3 Disk 4
Segment 4
Segment 8
Segment 12
Disk 1
Segment 1
Segment 5
Segment 9
3_00010-00
LSI SAS2
Controller
Segment 3
Segment 7
Segment 11
SAS
Physical ViewLogical View
+
3_00011-00
Stripe 1
Stripe 2
Stripe 3
Stripe N
Stripe 1
Stripe 4
Stripe 7
Stripe N-2
Stripe 2
Stripe 5
Stripe 8
Stripe N-1
+
Stripe 3
Stripe 6
Stripe 9
Stripe N