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SMF or MMF for connecting two SANs?

We are connecting two SANs (2 GB) 500 meters away from each other through a fibre switch McData using LC GBICs (gigabit interface converter). Do you advise using single mode Fibre cable or multi-mode cable between two buildings? What spec of cable is required?
At 2 gigabytes per second (GBps) and 4 GBps, 500 meters would be at the limit using 50/125 µm multi-mode fiber (MMF), and 300 meters on 62.5/125 µm MMF. Given the option, I would go with 9 micron single mode fiber (SMF) optic cable.

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