the criteria are not met, the span setting makes no difference for the current logical drive.

12Highlight a spanning option and press <Enter>.

13Set the logical drive size.

14Move the cursor to Size and press <Enter>.

By default, the logical drive size is set to all available space in the array(s) being associated with the current logical drive, accounting for the span setting.

15Open the Advanced Menu to set the remaining options:

16Set the Stripe Size.

Stripe size specifies the size of the segments written to each disk in a RAID 1 or 5 logical drive. You can set the stripe size to 2 KB, 4 KB, 8 KB, 16 KB, 32 KB, 64 KB, or 128 KB. A larger stripe size produces higher read performance, especially if your computer does mostly sequential reads. However, if you are sure that your computer does random read requests more often, select a small stripe size. The default stripe size is 64 KB.

17Set the Write Policy.

Write Policy sets the caching method to write-back or write-through.

In Write-backcaching, the controller sends a data transfer completion signal to the host when the controller cache has received all the data in a transaction. This setting is recommended in standard mode.

In Write-throughcaching, the controller sends a data transfer completion signal to the host when the disk subsystem has received all the data in a transaction. This is the default setting in cluster mode.

Write-throughcaching has a data security advantage over write-backcaching, whereas write-backcaching has a performance advantage over write-throughcaching.

18Set the Read Policy.

Read-aheadThis option enables the SCSI read-ahead feature for the logical drive. You can set this parameter to No-Read-Ahead, Read- ahead, or Adaptive. The default setting is Adaptive.

PERC 3 BIOS Configuration Utility

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