145

WEB BROWSER-BASED CONFIGURATION

• Number of AV Stream

RAID controllers are required to have not only the function of

processing ordinary data but also the function of dealing with AV

(audio/video) stream data needing real-time processing. Since

the bus cycle used in RAID controller was designed to transfer

the computer data exactly, it was unsuitable for the transfer of AV

stream needing great band widths. They are required to do some

setting for the handshaking during the processing of stream data.

This setting is an object of transferring stream data efciently

on an existing RAID controller. Normally you should not need

to modify this value. Default value is 6. You can select between

6~256.

To decide how to set AV stream playout parameter, you need to

check the Number of Stream, Amount of Read Ahead, and Total

Cache Memory during runtime. You can try to adjust the three

numbers to get the best performance as your requirement. Num-

ber of Stream shows the number of stream added to the system,

Amount of Read Ahead shows the amount of Read Ahead data

taken from the cache without real disk execution, and Total Cache

Memory shows the total available memory being installed in the

RAID controller. The following is the rule of optimized setting for

the AV Stream Playout application.

• Optimize AV Recording

AV recording option is for video recording (no time limit), but if

used in normal operation, performance may be degraded. This

new feature there are 4 options; Disabled, Mode1, Mode2 and

Mode 3. Default value is Disabled. Our controller cache uses LRU

method, there have no special memory capacity reserved for read

or write. The Mode 1, 2 and 3 are used for dene the command

sorting method. The default sorting method is helpful for normal

applications, but not useful for AV applications, so we have de-

ned three different sorting methods for these special applica-

tions. To decide how to optimize AV stream recording parameter,

you need to adjust the Optimize AV Recording, and Write Buffer

Threshold during runtime.

• Read Performance Margin

The “Read Performance Margin” is for controller to reserve n%

read margin during AV stream recording.

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Areca ARC-1882LP User Manual Page 145

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