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In the BIOS for the megaRAID select the following
Objects->physical drives
This will bring up a graphic of the drives. Used the arrow key to hightlight a drive and press enter. This will give you a menu for the drive. Use the arrow keys to highlight "set write cache" and press enter to get a prompt to enable or disable the write cache. Enable the write cache for all physical drives. Exit out of the BIOS and reboot.
I did try WRITETHRU after enabling each drive's cache but the write performance was still dismal. I have heard there is an optional battery pack for the 150-6. WRITEBACK will defintely improve the write performance, however I have heard that WRITEBACK on the 150-6 can only be enabled if the battery pack is present on the card. I don't have a 150-6 so I can't verify this.
Nate
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