I have a single FC switch here that has a bunch of servers hanging off of it. Currently it is zoned (as per my previous question, Fibre Channel zoning best practices) by WWN, one zone for each pair of (server, disk array).
My question is, is there any reason I shouldn't do this zoning by port instead of WWN? The switch is already labeled with a server name per port, and I don't expect to do any moving of cables. I'm tending toward zoning by port because it allows me to replace an FC card without rezoning. That's not something you need to do often, you say? You're probably right, but I'm in the middle of a period where I have to do it a lot.
If it matters, it's a QLogic switch with QLogic or Brocade FC cards and a NetApp filer.