[PVE-User] Cluster network via directly connected interfaces?

[Uwe Sauter]

FYI:

I had such a thing working. What you need to keep in mind is that you should configure both interfaces per host on the 
same (software) bridge and keep STP on… that way when you loose the link from node A to node B the traffic will be going 
through node C.

+--------------------+
|                    |
| Node A   br0       |
|         /   \      |
|       eth0   eth1  |
+------/-----------\-+
       /             \
+----/------+  +-----\----+
|  eth1     |  |    eth0  |
|  /        |  |       \  |
| br0--eth0-----eth1--br0 |
|   Node B  |  |  Node C  |
+-----------+  +----------+




Am 22.11.18 um 19:42 schrieb Frank Thommen:
> What I /really/ meant was "but the throughput would /not/ be higher when using a switch"...
> 
> 
> On 11/22/2018 07:37 PM, Frank Thommen wrote:
>> But the throughput would be higher when using a switch, would it?  It's still just 1Gbit
>>
>> frank
>>
>>
>> On 11/22/2018 07:34 PM, Mark Schouten wrote:
>>> Other than limited throughput, I can’t think of a problem. But limited throughput might cause unforeseen situations.
>>>
>>> Mark Schouten
>>>
>>>> Op 22 nov. 2018 om 19:30 heeft Frank Thommen <frank.thommen at uni-heidelberg.de> het volgende geschreven:
>>>>
>>>> Please excuse, if this is too basic, but after reading https://pve.proxmox.com/wiki/Cluster_Manager I wondered, if 
>>>> the cluster/corosync network could be built by directly connected network interfaces.  I.e not like this:
>>>>
>>>> +-------+
>>>> | pve01 |----------+
>>>> +-------+          |
>>>>                     |
>>>> +-------+     +----------------+
>>>> | pve02 |-----| network switch |
>>>> +-------+     +----------------+
>>>>                     |
>>>> +-------+          |
>>>> | pve03 |----------+
>>>> +-------+
>>>>
>>>>
>>>> but like this:
>>>>
>>>> +-------+
>>>> | pve01 |---+
>>>> +-------+   |
>>>>      |       |
>>>> +-------+   |
>>>> | pve02 |   |
>>>> +-------+   |
>>>>      |       |
>>>> +-------+   |
>>>> | pve03 |---+
>>>> +-------+
>>>>
>>>> (all connections 1Gbit, there are currently not plans to extend over three nodes)
>>>>
>>>> I can't see any drawback in that solution.  It would remove one layer of hardware dependency and potential spof (the 
>>>> switch).  If we don't trust the interfaces, we might be able to configure a second network with the three remaining 
>>>> interfaces.
>>>>
>>>> Is such a "direct-connection" topology feasible?  Recommended? Strictly not recommended?
>>>>
>>>> I am currently just planning and thinking and there is no cluster (or even a PROXMOX server) in place.
>>>>
>>>> Cheers
>>>> frank
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>>
>