Datacenter migration - F5 question

If I understood the work correctly, you have 2 data centers, and you moving both F5s to new data centers.

For network failover does not matter if you are 1 meter apart of 600Km (or miles), as long as you can talk with the peer, and you have layer 2 between the data centers as you said you have, otherwise, HA would not work well (at least without some crazy dynamic routing).

Before the work, make sure you have both an HA vlan and management configured for failover (I can send a solution about that if you need).

Choose one F5 to move, failover in case it is in active mode. Take to the new data center, power on and make it forced offline (just for precaution). Connect the management, make sure you can ping the other peer management IP. If you can ping, just release the force offline, and it should go for standby mode. Now connect the other cables, make sure pools come green. Make this unit active, test the application, and now start the process again with the other unit.