구차니의 잡동사니 모음

What is happening to your card is that it sees that you do not have a backup battery supply. It automatically defaults to the very slow read and write speeds because of it to ensure no loss of data in case of a power failure. I very strongly recommend that you have the battery backup unit that can attach to the card or a UPS attached to the computer. You paid a lot of money for the card and drives so you do really need that battery backup to prevent the card from requiring you to do a rebuild of the Raid system if there is an interruption of power to it or a blue screen reboot. But on the other hand you can override the settings in your web based browser. Beware though that if you do not have a battery backup, you may be required to replace a dropped drive in your Raid with a new drive and not allow you to just do a rebuild.  Log in as Management and click the management tab. Under Unit Policies change the following setting to: Write Cache: checked Read Cache: Intelligent Auto Verify: checked Queuing: checked StorSave: Performance It will come up with several warnings that it does not see a battery backup. Override at your own peril to increase your speeds. [링크 : http://hardforum.com/showthread.php?t=1510547]

예전 설정사진에서도 보면 BBU가 없으면 Write Cache 를 Enable 했을 경우 데이터 손실이 있을수 있다고 하는데
BBU 없이 Write Cache를 켤 경우에 퍼포먼스 제한이 생긴다면, Write Cache만 Disable 해보면 차이가 날지도 모르겠다.

 
아무튼 여러종류의 RAID를 테스트해본 결과에서도 3ware가 썩 좋은 결과는 얻지 못했는데
아마도 BBU가 문제라면 이 테스트의 결과가 뒤집힐수도 있겠다.

[링크 : http://tweakers.net/reviews/557/all/comparison-of-nine-serial-ata-raid-5-adapters.html] 

--- 2011.707.31 추가
펌웨어 업데이트 / 드라이버 업데이트 / Write Cache 꺼도 속도는 거의 변화가 없다 -_-
BBU 를 질러야하나? OTL

펌웨어 / 드라이버를 교체하고 테스트 해보았지만 유의미한 결과는 보이지 않는다.

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