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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 Figure 8-1, 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.
Figure 8-2 shows a logical view and a physical view of Integrated 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
+