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B-17
LSI SAS RAID
4.3 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 Kbyte 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 4.1, segment 1 is written to disk 1, segment 2 is
written to disk 2, segment 3 is written to disk 3, and so on. W hen the system reaches
the end of the disk list, it continues writing data at the next available segment of disk
1.
Figure 4.2 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.
9182v1.0-Appendix B(LSI SAS RAID).p65 2006/11/8, 上午 11:52 17