I would go for OR pull as well.  But I would suggest that after OR pull you take out the CX devices and mount the VMAX devices and run your application for a week before you forklift the server to the target data center.  The upside to this is that you ensure your data on the VMAX is intact and that once the server is in the target data center, starting up would be a breeze.  But the downside is that you will have two downtimes (1. moving to the VMAX and 2. moving the server to the target DC).  Just my 2 cents worth.
Hello,  We need to migrate a server which is connected to CX600 to VMAX .. Could any one tell me what is the best online migration tool for this approach. The plan is once the Migration is completed server will be forklifted to the target data center and presented the target luns from VMAX. So please let me know your thoughts on how to approach .
CX600 to VMAX Migration