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RAID 5 drive sizes

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I need a second opinion. Our server's RAID 5 array is just about full and I'm looking into possible upgrade/expansion options. My supervisor says we can just throw in one large drive (larger than the other four 18GB Quantums that are in there now) and that will suffice and save money at the same time. I say that the drives must all be the same capacity to get the parity distribution right.

Who is correct? B)

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