Expand HP P400 Array Raid 5

I have an HP ML350 with a P400 256MB controller setup with Raid 5.
I want to expand the arrany but when I put in the new disk (same size as others) and open ACU, I do not get an option to expand the array.
I only get an option to create a new array.
I have updated the ACU and Firmware on the P400.
Why is this?
ie0Asked:
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andyalderConnect With a Mentor Commented:
Battery backed write cache is required for online expansion, properties of the controller should tell you the battery status or the ADU will also tell. They're about $120 if you haven't got one.
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