Areca ARC-1880 Series User Manual page 144

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 missing from
standard desktop drives. TLER is a method of signaling the sys-
tem 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 in-
ternal 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 command. 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 resident
cache memory (how full cache should get) before controller 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 and other sys-
tem overhead. Write buffer threshold 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. Consequently,
this can prevent a pause in data flow and there will be continues
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