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

[Frank Thommen]

Good point.  Thanks a lot
frank


On 11/22/2018 07:51 PM, Uwe Sauter wrote:
> 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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>>
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