Compex SCSI TO S-ATA RAID Dokumentacja Pobierz pdf (Strona 74)

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4-4

Page

Choose “Optimization for Random I/O” or “Optimization for Sequential

I/O,” then press [ENTER]. The “Random” or “Sequential” dialog box will

appear, depending on the option you have selected. Choose Yes in the

dialog box that follows to confirm the setting. Press [ESC] to exit and the

setting will take effect after the subsystem is restarted.

NOTE:

There is no longer a 512GB threshold for array optimization modes. If

an array is larger than 16TB, only the optimization mode for sequential

I/Os can be applied. Since logical drives of this size may not be

practical, there is actually no limitation on the optimization mode and

array capacity.

4.2.4 Write-Back Cache Enable/Disable

Figure 4 – 3: Write-Back Cache Enable/Disable Page

As one of the submenus in “Caching Parameters,” this option controls the

cached write policy.

Choose Caching Parameters, then press [ENTER]. Select Write-Back

Cache, then press [ENTER]. “Enabled” or “Disabled” will display the

current setting with Write-back caching. Choose Yes in the dialog box that

follows to confirm the setting.

Write-back caching can dramatically improve write performance by

caching the unfinished writes in memory and letting them be committed to

drives in a more efficient manner. In the event of power failure, a battery

backup module can hold cached data for days.

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Compex SCSI TO S-ATA RAID Dokumentacja Strona 74