Areca ARC-8050T3U 6-Bay Thunder3 Desktop RAID Storage Array - Manual (Page 93)

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WEB BROWSER-BASED CONFIGURATION
• SATA NCQ Support
The controller supports both SAS and SATA disk drives. The
SATA NCQ allows multiple commands to be outstanding within
a drive at the same time. Drives that support NCQ have an
internal queue where outstanding commands can be dynami-
cally rescheduled or re-ordered, along with the necessary
tracking mechanisms for outstanding and completed portions
of the workload. The RAID storage allows the user to select
the SATA NCQ support: “Enabled” or “Disabled”.
• 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.
• Volume Data Read Ahead
The volume read data ahead parameter specifies the control -
ler 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 set it from the com-
mand line using the Read Ahead option. The 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. Aggres-
sive read ahead is optimal for sequential access but it de-
grades random access.
• HDD Queue Depth
This parameter is adjusted the queue depth capacity of NCQ
(SATA HDD) or Tagged Command Queuing (SAS HDD) which
transmits multiple commands to a single target without wait-
ing for the initial command to complete.
• Empty HDD Slot LED
The firmware has added the "Empty HDD Slot LED" option
to setup the fault LED light "ON "or "OFF" when there is no
HDD installed. When each slot has a power LED for the HDD
installed identify, user can set this option to "OFF ". Choose
option "ON", the RAID storage will light the fault LED; if no
HDD installed.