Chapter 4: Overview of Integrated Striping Integrated Striping Description | SAS2 Integrated RAID Solution User Guide |
4.3Integrated 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
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.
LSI SAS2
Controller
SAS
Disk 1 | Disk 2 | Disk 3 | Disk 4 |
Segment 1 | Segment 2 | Segment 3 | Segment 4 |
Segment 5 | Segment 6 | Segment 7 | Segment 8 |
Segment 9 | Segment 10 | Segment 11 | Segment 12 |
Figure 8: Integrated Striping Example
The following figure shows a logical view and a physical view of an Integrated Striping volume with three disks.
Logical View |
| Physical View |
|
Stripe 1 | Stripe 1 | Stripe 2 | Stripe 3 |
Stripe 2 | Stripe 4 | Stripe 5 | Stripe 6 |
Stripe 3 | + | Stripe 8 | + |
Stripe 7 | Stripe 9 | ||
Stripe N | Stripe | Stripe | Stripe N |
|
|
|
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.
Page 24 | LSI Corporation Confidential August 2010 |