A battery-backed write cache prevents pending writes to HDD-type devices being lost when power is lost.

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BBWC: in theory a good idea but has one ever saved your data?

I'm familiar with what a BBWC (Battery-backed write cache) is intended to do - and previously used them in my servers even with good UPS. There are obvously failures it does not provide protection ...
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BBWC Parts for Proliant DL380 G5 / HP Smart Array P400

I have a Proliant DL380 G5 server with HP Smart Array P400 controller, the performance of the disk I/O is bad lately and I found out that during my research that I can improve it by enabling the write ...