Installation guide
Software Operation Manual
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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.
Number 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.
4.8.2.7 Optimize AV Recording
AV recording option is for video recording (no time limit), but if used in normal
operation, performance may be degraded. There are 4 options in this new feature;
Disabled, Mode1, Mode2 and Mode 3. Default value is Disabled. To decide how to
optimize AV stream recording parameter, you need to adjust the Optimize AV
Recording and Write Buffer Threshold during runtime.
Example: Long time video recording (low data rate), such as Surveillance
Optimize HD Edition option: disabled
Optimize AV Recording option: mode3
Write Buffer Threshold: 5%
4.8.2.8 Read Performance Margin
The “Read Performance Margin” is for controller to reserve n% read margin during AV
stream recording.
4.8.2.9 Write Performance Margin
The “Write Performance Margin” is for controller to reserve n% write margin AV
stream recording.
4.8.2.10 Read And Discard Parity Data
Determine if parity data is to be read and discarded.
If reading block is not in sequence, some HDD will run as random mode,
where performance will be decreased, therefore, by enabling Read And
Discard Parity Data, data and parity data both will be read and parity data
will be discard, reading block will continue and as a result user can get more
smoothly performance.
4.8.2.11 Fail Disk For Any Timeout
The options are: “Enabled”, “Disabled”.