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How Do I Change Physical Drive Read and Write Cache Settings?

4-36 RAID EzAssist User’s Manual

How Do I Change Physical Drive Read and Write

Cache Settings?

If you are unfamiliar with the terms “Read Cache,” “Read Ahead,” “Write

Cache,” “Write Through,” or “Write Back” caching, please refer to the

Glossary for a detailed definition.

In a nutshell, Read Ahead caching speeds read performance in situations

where large blocks of sequential data need to be read. For random read

situations, however, it may actually reduce performance.

Write Back caching speeds write performance but risks loss of data in the

cache buffer should power fail. Use Write Back only if you have a battery

backup unit (BBU) or uninterruptable power supply (UPS) installed to

preserve data in the cache.

☞ Open the Device Configuration screen as described in “How

Do I View Physical Drive Status and Information?” on page 4-33.

☞ Use the arrow key to select the Read Cache field, then...

☞ Press the + or - key to find your desired caching method

(“Enabled” = Read-Ahead, or “Disabled” = Normal),

☞ Press Spacebar to display a box of available choices, use the

arrow key to select your desired read caching choice, then press

Enter.

☞ Use the arrow key to select the Write Cache field, then...

☞ Press the + or - key to find your desired caching method

(“Enabled” = Write-Back, or “Disabled” = Write-Thru),

☞ Press Spacebar to display a box of available choices, use the

arrow key to select your desired write caching choice, then

press Enter.

Once you’ve set the Read Cache and Write Cache as desired,

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Mylex AcceleRAID 250 Informations techniques Page 162