Mutipath Storage Controllers are Fun

I have been trying to figure out how to get our Bladecenter blades to talk properly to the SAN controller. The SAN has two fibre-channel controllers, with two separate fibre paths to the data. I created a volume under SLES9 on one of the arrays, and put some data on it. When i transfer it from one SAN controller to the other, it moves back to the first controller when I access the disks under SLES9. This confuses me, and tells me that I may not have the multipathing driver for the Qlogic controller cards set up properly. Hmm..