Storage Expansion on PWS400au

What are my storage expansion options on a PWS400au? I would like to put an external StorgeWorks array on it. I have 2 of them I could use, one uses a BN21H cable to connect to a system (it previously plugged into my now-dead AS200 system); and one uses a BN31S cable, and previously connected into a SWXCR port on my long-dead AS1000 system.

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