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- I have ran the DVS switch upgrades and have never scene any failures
- The only we need to keep in mind is that host are in compatible and also you wont be able to add old ESXi version to the new DVS.
- Restore configuration can be done for a back up plane but i don't think that is recommended anywhere as it will revert back to old version if there was any issue .
- Brief network outage can be expected , but that mostly occurs if hare using NSX and additional features such as private and isolate vlan .
I would suggest take the backup of the configuration and do the upgrade in maintenance window .