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

[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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> 

-- 
Frank Thommen          | HD-HuB / DKFZ Heidelberg
                        | frank.thommen at uni-heidelberg.de
                        | MMK:  +49-6221-54-3637 (Mo-Mi, Fr)
                        | IPMB: +49-6221-54-5823 (Do)