Proware Fibre to SAS/SATA RAID Subsystem, User Manual

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Fibre to SAS/SATA RAID Subsystem
User Manual 89
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
efficiently 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.
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.
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 define the command sorting method. The default
sorting method is helpful for normal applications, but not useful for AV applications,
so we have defined three different sorting methods for these special applications. To
decide how to optimize AV stream recording parameter, you need to adjust the
Optimize AV Recording, and Write Buffer Threshold during runtime.
Read And Discard Parity Data
This function is used to determine if parity data is to be read and discarded.
Hitachi SATA HDD Speed
This function is used to set the Hitachi SATA HDD Speed.
WDC SATA HDD Speed
This function is used to set the WD SATA HDD Speed.
Seagate SATA HDD Speed
This function is used to set the Seagate SATA HDD Speed.