I have a Windows Server 2008 x64 Standard virtual machine that runs on a machine with a hardware RAID controller, a Perc 6/i, which has a battery on-board.

Doing everything I can for additional performance, I think I should disable this. Is this very dangerous though?

My understand is that Battery Backed Write Caching gives a performance boost to the host OS, telling it the write was complete when they are still sitting in flash waiting to be written.

However, I can't see how it would be detrimental to performance, but is there a gain (even if marginal) to enabling it / disabling it?

P.s. There machine has a backup power.

Here is a screen shot for clarification: