Hey Rock, Hopefully this helps a bit.
1. Are other machines connected to the G4 via Fibre as well? Or is it just the RAID to the G4? If its just the RAID, then you probably wont see any difference unless you are transfering VERY large amounts of (IE) HD Video between the G4 and the RAID.
My guess if everything goes Ethernet to the G4 anyway, so you will limited more by your network.
B) No/Yes. Its the same as Ethernet, you take it out, you drop the connection. If nobody is using it, you should be able to disconnect it with no issues. However, I do not have an XServe RAID, so I cannot be sure.
C) You setup the controllers yourself, so you can have one side on one cable, or both cables for the whole thing. It's all in your setup. If you are not sure about this, don't screw around as you will prob break something, hire somebody who knows the stuff.
D) not really. The speed comes from the FibreCard and the Fibre itself, not the Processors on the machine. If you have LOTS of users, then you would get better performace as the Server (G5 or G4) is most likely handling the requests, the authentication, the AFP/SMB, etc, etc, etc..
E) Not sure at all what you mean here.
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