Supermicro AOC-USASLP-L8I Manual de usuario descargar pdf (Pagina 27)

4-9

Chapter 4: MegaRAID BIOS Configuration Utility

3. Select INITIALIZE from the submenu and press ENTER.

4. Select YES at the prompt and press ENTER.

The CU displays a bar graph showing the initialization progress.

5. When initialization completes, press E

SC to return to the previous menu.

If you press ESC while initialization is in progress, the STOP, CONTINUE, and ABORT

options are available, as explained earlier in "First Initialization Method", step 5

above.

4-3 Setting the Hard Disk Write Cache and Read Ahead

Policies

You can use the MegaRAID BIOS CU to set the hard disk drive Write Cache and Read

Ahead settings. Any read or write cache policy changes apply to all virtual drives on an

array. In other words, if two virtual drives are defined on a single array and you change

the Read Ahead setting on one virtual drive, the change will also apply to the other

virtual drive on the array.

The Disk Write Cache and Read Ahead policies can be set to O

N or OFF.

• When the disk Write Cache is ON, a write transaction is considered to be complete

when all the data has been written to the disk cache. When disk Write Cache is O

FF,

the write transaction is complete only when the data has been written to the disk.

• When disk Read Ahead is O

N, extra data is read sequentially ahead of the data that

is actually requested and is stored in a cache. If the additional read-ahead data is

then requested, it can be read faster from the cache than from the disk directly.

Follow these steps to view or change the virtual drive Write Cache or Read Ahead

settings:

1. From the M

ANAGEMENT menu, select OBJECTS J VIRTUAL DRIVE J VIRTUAL DRIVE N

J V

IEW/UPDATE PARAMETERS.

2. Use the arrow key to move the cursor to D

ISK WC or READ AHEAD and press ENTER.

3. Use the arrow key to select O

FF or ON for DISK WC (DWC) or READ AHEAD.

4. When you see the prompt, CHANGE DWC or CHANGE READ AHEAD, use the arrow

key to select O

FF or ON, then press ENTER to change the cache setting.

The settings are changed for all virtual drives defined on the array.

NOTE: When the disk Write Cache is ON, there is a danger that data could be

lost if the power fails before the cached data is written to disk.

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