[PVE-User] question regarding quorum/qdevice on raspberry pi for dual-node cluster

Roland @web.de devzero at web.de
Thu Feb 20 15:20:48 CET 2020


thank you,

why would we need a full corosync instance on RPI at all when it's not
supported and Qdevice is the better way for quorum ?

i.e. who is using full corosync on RPI at all and for what besides
quorum/whitness device?

i there a real purpose/benefit or does that wiki page simply describe
the "old way to go before qdevice did exist" ?

regards
roland


Am 20.02.20 um 14:56 schrieb Aaron Lauterer:
> That wiki page describes how to set up a full corosync instance on the
> RPI.
>
> Using one with Qdevice and the corosync-qnetd service installed on it
> is fine. See our documentation for it [0].
>
> I updated the warning on the Wiki page to make it clearer why that
> wiki page needs to be considered with care.
>
>
> [0]
> https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_corosync_external_vote_support
>
> On 2/20/20 1:40 PM, Roland @web.de wrote:
>> hello,
>>
>> on this page https://pve.proxmox.com/wiki/Raspberry_Pi_as_third_node
>> there is told:
>>
>> "Raspberry Pi as third node - This is only suited for testing or homelab
>> use. Never use it in a production environment! Simply use a QDevice!""
>>
>> On https://pve.proxmox.com/wiki/Roadmap  for Proxmox 5.4 there is the
>> following announcement:
>>
>> QDevice support via `pvecm`
>>
>>   * primarily for small 2-node clusters adding a qdevice can help
>>     mitigate the downside of not being able to reboot one node without
>>     losing quorum (and thus the ability to make any changes in the
>>     cluster) ** Can also help in clusters with a larger even number of
>>     nodes by providing a tie-break vote.
>>   * Integration into pvecm and PVE stack vastly simplifies adding a
>>     qdevice (it was possible manually before as well)
>>
>>
>> my question is why there is  information around which looks like
>> discouraging rasperry pi as third node for quorum, i.e.  is a raspberry
>> pi with Qdevice  (
>> ->https://blog.jenningsga.com/proxmox-keeping-quorum-with-qdevices/ )
>> suitable for production use or not ?
>>
>> regards
>> roland
>>
>>
>>
>>
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>


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