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I've been looking for MDs' on ebay, but i'm not sure what version i need to get.
I need a 4Gb switch with atleast 16 ports. Would this one do ? - http://www.ebay.com/itm/Cisco-DS-C9...79?pt=US_Network_Switches&hash=item27d4fc0b37
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That should work for you. It has 16 active ports which is what you said you needed. The 9124 is a great switch.
Edit: Just wanted to add that you should get 2. The VNX5100 has 2 storage processors so what you could do is take one port from each storage processor and connect it to each switch. For example you could take SPA port 0 and SPB port 1 and connect it to the first switch and then take SPA port 1 and SPB port 0 and connect to the second. Then if your servers have dual port FC adapters you could connect one into each switch then configure your zoning on each switch. If configured properly you could have dual active paths where you could lose a port on your server, lose a switch, or even lose a storage processor and everything will keep on trucking. Note, you may need 3rd party software like PowerPath on your servers to support multiple active paths and you will need to make sure you specify the correct Failover Mode on the VNX5100 when you register your host initiators in order to support active/active. I believe it is ALUA 4 if my memory serves and it might be the default on the VNX5100 but I would just check.
Just get a couple cheap MDS 9124 switches. They work great..been around forever. Make sure you get enough port licenses for what you need.
Why would you need to have single initiator to single target ?Zoning should be single initiator - single target. Basically, there should be one zone per path your host has to the storage.