Hi Patrick, Yes, the prepare VIOS Maintenance puts the vSCSI/vFC in defined state and changes the SEA mode to standby. Once the prepare is done and any further steps are done in the VIOS - like update/upgrade, a reboot of the VIOS should bring back the vSCSI/vFC to available state. For SEA, you have to change the mode again - it can now be done from the HMC itself (System -> Virtual Network -> Network Bridges in the GUI). For vNIC, you can failover back using the hmc command chhwres with V10 R1 M1010 (Eg:- chhwres -r virtualio -m <system name> -o so --rsubtype vnicbkdev -p <target VIOS>). Hope this helps !