AOC-USAS-L8i Add-on Card User’s Manual
8-2
• SES status LED support for drives used in IS volumes
8-3 IS Description
The IS feature writes data across multiple disks instead of onto one disk. This is
accomplished by partitioning each disk’s storage space into 64-KB stripes. These
stripes are interleaved round-robin, so that the combined storage space is composed
alternately of stripes from each disk.
For example, as shown in Figure8-1, segment 1 is written to disk 1, segment 2 is written
to disk 2, segment 3 is written to disk 3, and so on. When the system reaches the end of
the disk list, it continues writing data at the next available segment of disk 1.
Figure8-2 shows a logical view and a physical view of Integr ated Striping configuration.
The primary advantage of IS is speed, because it transfers data to or from multiple disks
at once. However, there is no data redundancy; therefore, if one disk fails, that data is
lost.
Figure 8-1. Integrated Striping Example
Figure 8-2. Integrated Striping – Logical and Physical Views

LSI

Fusion-MPT

Controller

Disk 1 Disk 2 Disk 3 Disk 4
Segment 1
Segment 5
Segment 9
Segment 2
Segment 6
Segment 10
Segment 3
Segment 7
Segment 11
Segment 4
Segment 8
Segment 12
SAS
Logical View Physical View

+

Stripe N
...
Stripe 3
Stripe 2
Stripe 1
Stripe N
...
Stripe 3
Stripe 2
Stripe 1
Stripe N
...
Stripe 3
Stripe 2
Stripe 1
Stripe N
...
Stripe 3
Stripe 2
Stripe 1

+