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Folks, We have 7 Mcdata M4500 switches in our backup fabric and we want to replace it with one Brocade 48k switch. Our concern is that the device files will change when we replace the switches. Please answer the following questions: 1) Is there a way to preserve the device files?. What if we ISL the brocade switch into the mcdata fabric and then one by one remove the mcdata switches. Will this preserve the device files?  2) Is it possible to copy the zoning from the mcdata switches to the brocade switch without connecting the new switch to the fabric, if so how to do it?  3) If i connect the brocade switch to the mcdata fabric temporarily and then remove it, will all the zoning information be automatically copied to the brocade switch?  Thanks in advance for all your help. 
Replacing 2gb mcdata switches with 4gb/sec brocade switch