Robotic failover configuration

Hi

I have a library which has auto failover robotic arm,
Drive1 + robotic = assigned to mediaserver1
Drive2 + robotic (secondary path) assigned to mediaserver2

When drive1 active, robotic control host is mediaserver1 and all tapes will mark control host = mediaserver1.
If drive1 down, robotic will autoswitch to drive2 which connected to mediaserver2. Netbackup will not auto detected this failover.

Question:
1. How’s netbackup configuration to get auto failover?
2. If no config for the auto failover, how’s the manual step?
ony other best config for this case?

Thanks,
IAW