Configuring an Array

3.Exit from the previous screen, and then move the highlight to the logical drive. If the controller has a battery-backed write cache, there should be an entry Disable Cache in the right-hand panel, implying that the cache is enabled. If the entry is Enable Cache, the cache is currently disabled; enable it.

4.In the Logical Configuration View panel, select the logical drive that you want to migrate and then press the Enter key.

5.Select Drive Settings, and then press the Enter key.

6.Change the RAID level or stripe size shown on this screen.

Table 5-3: Supported Stripe Sizes for a Given RAID Level

Fault-Tolerance Level

Supported Stripe Sizes (KB)

Default (KB)

RAID 0, RAID 1+0

8, 16, 32, 64, 128, 256

128

 

 

 

RAID 5, RAID ADG*

8, 16, 32, 64

16

 

 

 

*Not all controllers support RAID ADG.

Table 5-4: Optimum Stripe Size for a Given Application

Type of Server Application

Suggested Stripe Size Change

Mixed read/write

Accept the default value

 

 

Mainly sequential read (such

Use larger stripe sizes for best performance

as audio/video applications)

 

 

 

Mainly write (such as image

Use smaller stripes for RAID 5, RAID ADG*

manipulation applications)

Use larger stripes for RAID 0, RAID 1+0

 

 

 

*Not all controllers support RAID ADG

7.Press the Esc key to accept the changes and begin migration.

You can check the progress of the migration at any time by pressing the F3 key and then scrolling to the progress bar near the bottom of the screen.

HP Smart Array 641/642 Controller User Guide

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