Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 89)

BIOS CONFIGURATION
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3.7.5.8 Volume Data Read Ahead
The volume read data ahead parameter specifies the controller
firmware algorithms which process the read ahead data blocks
from the disk. The "Data Read Ahead" parameter is normal by
default. To modify the value, you must set it from the "Raid
System Function" using the 'Volume Data Read Ahead" option.
The default "Normal" option satisfies the performance require-
ments for a typical volume. The "Disabled" value implies no read
ahead. The most efficient value for the controllers depends on
your application. The "Aggressive" value is optimal for sequential
access but it degrades random access.
I/O Port Addr : 28000000h, F2(Tab): Select Controller, F10: Reboot System
Areca Technology Corporation RAID Controller
Main Menu
Quick Volume/Raid Setup
Raid Set Function
Volume Set Function
Physical Drives
Raid System Function
More System Functions
Hdd Power Management
Ethernet Configuration
Alert By Mail Config
View System Events
Clear Event Buffer
Hardware Monitor
System information
Raid System Function
Raid System Function
Mute The Alert Beeper
Alert Beeper Setting
Change Password
JBOD/RAID Function
Background Task Priority
SATA NCQ Support
HDD Read Ahead Cache
Volume Data Read Ahead
Hdd Queue Depth Setting
Empty HDD Slot LED
Controller Fan Detection
Auto Activate Raid Set
Disk Write Cache Mode
Write Same Support
Capacity Truncation
Volume Data Read Ahead
Volume Data Read Ahead
Enabled
Aggressive
Conservative
Disabled
Normal
3.7.5.9 Hdd Queue Depth Setting
This parameter is adjusted the queue depth capacity of NCQ
(SAS HDD) or Tagged Command Queuing (SAS HDD) which
transmits multiple commands to a single target without waiting
for the initial command to complete.