Avago-technologies SAS 9300-4i Host Bus Adapter Uživatelský manuál stáhnout pdf (Strana 24)

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SAS-3 Integrated RAID Solution User Guide

November 2012

Chapter 4: Overview of Integrated Striping

Integrated Striping Description

4.3 Integrated Striping Description

On Integrated Striping volumes, the firmware writes data across multiple disks instead of onto one disk by

partitioning each disk’s storage space into 64-KB stripes. The firmware interleaves the stripes in such a way that the

combined storage space consists alternately of stripes from each disk.

The following figure shows an example of Integrated Striping. In this example, 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, Integrated Striping volumes have no data redundancy. Back up the data on other media to

avoid losing unsaved data if one disk fails.

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