Installation guide

Software Operation Manual
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5.5.5.7 HDD Read Ahead Cache
Allow Read Ahead (Default: Enabled)—When Enabled, the drive’s read ahead
cache algorithm is used, providing maximum performance under most
circumstances.
5.5.5.8 Volume Data Read Ahead
The Read data ahead parameter specifies the controller firmware algorithms
which process the Read Ahead data blocks from the disk. The Read Ahead
parameter is normal by default. To modify the value, you must know the
application behavior. The default normal option satisfies the performance
requirements for a typical volume. The disabled value implies no read ahead.
The most efficient value for the controllers depends on your application.
Aggressive read ahead is optimal for sequential access but it degrades random
access.