Need to extend RAID on ML350 G6

[Aerosys]

As the title states, I have two logical drives created in my raid array. One is 30gb and another is 500gb I believe. The person that configured the server only gave the C: partition 30gb, which is now causing us to run into a size problem. I need to extend that logical drive. I have some unused space in my RAID configuration, but I can't extend the C: drive. Supposedly l need a BBWC, but I'm honestly lost on exactly what I need. I don't want to waste time and money with ordering a part that's useless. I would attach an ADU report but I can't attach .zip files and the text is too long for pastebin. It's a Embedded Smart Array P410i

Thanks in advance!

[Aerosys]

Anyone? Lol