I hit a snag last night. I needed to remove a nic from a host bond in ovirtmanage to create a new bridge line for user access to VMs. The process hung the box and I had to go put hands on the physical console (more reason to get the ipmi network setup!). The error message was "can't add eth3 to bond. already bonded" (or close). It seems the only way to remove a nic from a bond is to unload the bonding module. Apparently the ovirt process doesn't call a modprobe -r bonding during a network reset on the managed hosts. stop network, unload bonding, start network worked fine from the console.

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James P. Kinney III

Every time you stop a school, you will have to build a jail. What you gain at one end you lose at the other. It's like feeding a dog on his own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

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