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1Select Objects—>Physical Drive and press <Enter>. The Physical Drive Selection Menu displays.

2Highlight a drive on the Physical Drive Selection Menu using the arrow keys and press <Enter>.

The action menu for the physical drive displays.

3Use the arrow key to select Make HotSpare, then press <Enter>. The indicator for the selected physical drive changes to HOTSP.

Parameters

The parameters contain the settings for the stripe size, write policy, read policy and cache policy. The policies and default settings are described in the following information.

Stripe Size specifies the size of the segment 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 better read performance, especially if your computer does mostly sequential reads. If you are sure that your computer does random reads more often, select a small stripe size. The default stripe size is 64 KB.

Write Policy specifies the cache write policy. You can set the write policy 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 is the default setting.

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.

Write-throughcaching has a data security advantage over write-backcaching. Write-back caching has a performance advantage over write- through caching.

Read Policy specifies that the SCSI read-ahead feature is used for the logical drive. You can set this parameter to Normal, Read-ahead,or Adaptive. The default setting is Adaptive.

Normal specifies that the controller does not use read-ahead for the current logical drive.

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