When a NAS server fails over, it sends out IIRC 8 gratuitous ARPs to the switch from the target array, basically registering it into the CAM table (aka MAC-ADDRESS-TABLE) on the target switch (that is if the IP isn't changing).  If your 2 Unity boxes are at the same site, or if you are taking the IP with you to the other side by spanning the VLAN across sites then the trace route might not look very different.  If the IP on the target site is different, then the NAS Server would be dynamically re-registering in DNS.  Then you should be doing nslookups, and seeing if the IP changes.  ~Chris
Hello,  We are performing some DR tests for a test CIFS share. We do a trace route to the NAS server IP, then failover to the DR Unity/site run another traceroute. Lastly we fail back to the original Unity/Site and run another traceroute. They all have the same hops. Is that normal? Am I missing something here or performing the wrong steps for the DR test. Any feedback is appreciated. 
Unity CIFS share traceroute