Oracle VM Server x86: How to get a redundant network for the heartbeat

A while ago i played around with Oracle VM Manager

• Setting up an Oracle VM Manager
• Setting up an Oracle VM Server node 
• discovering a node, creating a pool and repository 
• Oracle VM Server: my first vm: Error: HVM guest support is unavailable
• Oracle VM Server x86: Creation of a virtual machine 
• Oracle VM Server: How to add ISO images to your repository  
• Oracle VM Server x86: Discovering a server/node + setting up a repository, server pool and networking

I was wondering, if i can setup a redundant network for the heartbeat on my virtualbox playground. My question was: Can i add an additional network and stripe the heartbeat over both networks or do i have to configure 2 network interfaces and use bonding.

So let's start:
Open the OVM Manager and go to "Networking":

and hit the green plus to add a network:

Just hit next and provide a name and toggle the checkbox "heartbeat":

Then expand the tree to the new NIC and choose it:

Then mark the row and hit next:

For my use case  i did not add any VLANs - and after all the heartbeat is striped over both networks:

 

But this is not really true:

Message:	OVMRU_001079E Cannot add Ethernet device: eth1 on oraclevm, to network: hearbeat, because server: oraclevm, already has cluster network: 192.168.178.0. [Sat Nov 24 11:39:39 EST 2018]

Hmmm. This means the OVM Manager shows two hooks, but the second one does not work.

After some investigation: The network "heartbeat" was created but the port (eth1) was missing. 

So i removed the "Cluster Heartbeat" and then i added the port eth1 including the checkbox "Virtual Machines".

The ovm server showed up eth1:

# ifconfig |grep ^[a-z,0-9]
108e472f6e Link encap:Ethernet  Hardware Adresse 08:00:27:43:D9:4C  
bond0     Link encap:Ethernet  Hardware Adresse 08:00:27:61:51:35  
c0a8b200  Link encap:Ethernet  Hardware Adresse 08:00:27:61:51:35  
eth0      Link encap:Ethernet  Hardware Adresse 08:00:27:61:51:35  
eth1      Link encap:Ethernet  Hardware Adresse 08:00:27:43:D9:4C  
lo        Link encap:Lokale Schleife  

But adding "Cluster Heartbeat" once again results in a job, which was in status "running" forever.

Conclusion: You should never stripe the "Cluster Heartbeat" over more than one network!