Should my Device ID's and Partition ID's as shown in NSSMU be the same across cluster nodes?

I'm experimenting with a NW6.5 cluster. When i add a new LUN on the san, a "cluster scan for new devices" does not pick up the new luns. Should it? If i do an F2-Scan in NSSMU on each node, it does find the new LUN. But the device id is different on each node. Partitions created also have differed id's. Is this normal or should i be concerned?