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

[Frank Thommen]

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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-- 
Frank Thommen          | HD-HuB / DKFZ Heidelberg
                        | frank.thommen at uni-heidelberg.de
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