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Conecting pv220s to pe2650

Hi, forum!!!
My boss buy a new pv220s to grow the disk space.
In the packaging, I see only a cable w2n, 4m.
I need to buy to scsi/raid board to put on the pe2650, and go on.
But, I don't know what is the better option.
My boss buy only 3 disks, and, then, my options are a minimal raid-5 in software, on in hardware.
If my option is "raid by software", I sow the board:
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