I recently went through a VSAN consolidation where i took 2 VSANs and combined them into a new VSAN. The problem i have run into is that even after making sure that the domain id's of the source and destination VSANs were the same, the fcid's of the individual ports that were in the source VSAN changed when i moved them into the new VSAN. For HP-UX systems, this is a huge issue because HP-UX uses the fcid of the storage port to generate it's HW addresses for disks. With the fcid of the storage ports changing, this caused all of the HP-UX systems to reconfigure thier HW addresses and ended up causing some systems to crash.
To make it worse, when i try to go into domain manager in device manager to change the fcid back to what it was, the switch has already reassigned the original fcid to something else. And even when i find one that hasn't been, and i try to change it, it complains about a duplicate WWN. there are no duplicate WWN's.... :-(
Is it possible to maintain the same FCID when changing the vsan assignment of a port?
Question2: I noticed that persistant fcids is enabled for both domains. do i simply need to disable that in order to change the fcid back to what it was?