Datoptic RM12-S6.TB - Rackmount Manuel d'utilisateur télécharger pdf (Page 37)

WEB BROWSER-BASED CONFIGURATION

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• Timeout Setting

Disk time-out is a registry setting that denes 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 controller

starts to ush 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

system 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 re-

sponse from the hard drives within a given time. Consequently,

this can prevent a pause in data ow and there will be continued

data access and stream. This feature is very useful for the video

streaming applications where there is high demand for constant

non-stop data ow with no interruption due to lower perfor-

mance of specic hardware.

• Amount of Read Ahead

Read-Ahead data is buffered in the RAID controller cache,

however, thereby cutting down on the amount of I/O trafc to

the disk. The Amount of Read Ahead denes how many data of

reading at a time, making more efcient use of the RAID sub-

system. This makes it possible to locate and re-issue the data

without repetitive hard parsing activities.

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Datoptic RM12-S6.TB - Rackmount Manuel d'utilisateur Page 37