Mylex AcceleRAID 250 Informations techniques télécharger pdf (Page 137)

Monitoring and Maintenance Activities

Manual No. 775029 4-11

How Do I Change Logical Drive Stripe Size and

Write Cache Settings?

If you are unfamiliar with the terms “Stripe Size,” “Write Cache,” “Write

Through,” or “Write Back” caching, please refer to the Glossary for a

detailed definition.

In a nutshell, Stripe Size is the size of the logically contiguous data block

mapped to a single disk. A stripe of data is divided over all disks in the drive

group.

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 Logical Drive Configuration screen as described in

“How Do I View Logical Drive Status and Information?” on page

4-8.

☞ Use the arrow key to select the Stripe Block Size field, then...

☞ Press the + or - key to find your desired stripe size,

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

arrow key to select your desired stripe size, then press Enter.

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

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

(“Write-Back” or “Write-Thru”),

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

arrow key to select your desired write caching method, then

press Enter.

Once you’ve set the Stripe Block Size and Write Cache as desired,

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Mylex AcceleRAID 250 Informations techniques Page 137