Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 187)

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WEB BROWSER-BASED CONFIGURATION
• TLER Setting
TLER (time-limited error recovery) functions provide support
for WD Caviar RE (RAID) series disks. This is a new option
from WD to support RAID features that were traditionally miss-
ing from standard desktop drives. TLER is a method of signal-
ing the system RAID controller in the event that an error
recovery process is taking longer than time-out specifications
allow. This prevents the RAID controller from dropping the drive
from the array during this period. Default value is manufacture
setting. You can select between 5, 6 and 7 second. This feature
is to setup the HDD internal timeout value.
• Timeout Setting
Disk time-out is a registry setting that defines the time that
RAID controller will wait for a hard disk to respond to a com-
mand. You can modify the retry value by entering a new value
in the edit box beside this button and then selecting the button.
Normally you should not need to modify this value. Default
value is 8 seconds: You can select between 3~8 second.
• Number of Retries
This setting determines the number of access that will be at-
tempted before the current command from the RAID controller
to the disk drive is aborted. You can modify the retry value by
entering a new value in the edit box beside this button and then
selecting the button. Normally you should not need to modify
this value. There are two selections, either 2 retry or 3 retry.
• Buffer Threshold
This new feature there are 3 options; 25%, 50%, 75%. The
percentage represents how much data should be kept in resi-
dent cache memory (how full cache should get) before control-
ler starts to flush data onto the hard drives. If the buffer is set
for 25%, then all 25% will be cached and is used for writing
data. The remaining cache memory will be used for reading
incoming write and other system overhead. Write buffer thresh-
old for 5% is added for video recording. This option will push
data to disk early.
This feature gives controller extra buffer time in case of slow
response from the hard drives within a given time. Conse-