Flash Backed Write Cache (FBWC) without capacitor pack

Solution 1:

You were correct in understanding that the write cache solution would help performance. However, you just didn't order the right parts. What you ordered was a 512MB chip. The reason the flash capacitor is external to the memory module/RAID controller is to preserve the old form-factor of the older battery-backed module (forward-compatible). The part number should have been #534916-B21 and should have included everything listed below:

If you don't have both parts pictured here, your solution won't work.

Left: RAM module. Right: External flash capacitor.

The capacitor unit is pretty key to the operation. Where did you buy this from? Nobody sells the memory module alone unless it's ordered as a spare or repair part.

In general, when ordering HP, look at the quickspecs for the product you wish to buy. In this case, the Smart Array P410 quickspecs would have given you specific part numbers (and compatibility notes) to make your solution whole.

Non-volatile cache RAID controllers: what kind of protection is there against NVCACHE failure?