[PVE-User] Best practice for quorum device between data centers?

Aaron Lauterer a.lauterer at proxmox.com
Fri Feb 28 09:48:38 CET 2020


Any thoughts about using QDevice with the corosync-qnetd service running 
in a third location?

AFAIK the QDevice mechanism can cope with higher latencies than corosync 
itself.

On 2/27/20 10:03 PM, John Thomas wrote:
> Maybe have a tiny PVE at a third location (call it PVE-quorum)?  That way,
> if one data center goes off line, you have the solution you need, the "up"
> data center still having a quorum.
> 
> JT
> 
> 
> 
> On Thu, Feb 27, 2020 at 12:05 PM Alexandre DERUMIER <aderumier at odiso.com>
> wrote:
> 
>> Well you could use a virtual quorum vm, but
>>
>>
>> dc1: 4 nodes + vm ha   dc2: 4nodes
>>
>> you loose dc1 -> you loose quorum on dc2, so you can't start vm on dc2.
>> so it's not helping.
>>
>> you really don't want to use HA here. but you can still play with "pvecm
>> expected" to get back the quorum
>> if 1 dc is down.  (and maybe do dc1: 5 nodes  - dc2: 4 nodes, to avoid
>> loose quorum on both side)
>>
>>
>> (also I don't known what is your storage ? )
>>
>>
>> ----- Mail original -----
>> De: "Thomas Naumann" <tom at chajuti.de>
>> À: "proxmoxve" <pve-user at pve.proxmox.com>
>> Envoyé: Jeudi 27 Février 2020 20:29:45
>> Objet: Re: [PVE-User] Best practice for quorum device between data centers?
>>
>> hi alex,
>>
>> thanks for your response...
>> that was our first idea too, but i don´t like it...
>> what about the idea of a virtual quorum device (VM) inside the cluster?
>> in worst case scenario (all physical connections between data centers
>> are broken) where will be manual choise to start virtual quorum on this
>> or that side of the cluster. Has anyone experience about this?
>>
>> regards,
>> thomas
>> On 2/27/20 6:49 PM, Alex Chekholko via pve-user wrote:
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