What is the best way to setup DNS for failover with Isilon using SyncIQ?  I have come up with 3 ways, but I wanted some feedback from others on what they are doing and any reasons to not do one of these three.

1. Create the Prod SmartConnect Zone name as an Alias on the DR SmartConnect Zone (prior to failover); redirect the Prod DNS Delegation to DR SSIP.
2. Delete the Prod DNS Delegation and create CNAME to point to DR Delegation
3. Create CNAMES (prior to failover) and point to either Prod or DR Delegations

I think any 3 of these will work, but what is best? Is there any adverse affect of having the Prod SmartConnect Zone name as an Alias on the DR box? 

Thanks for the input.