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

leesteken at pm.me leesteken at pm.me
Fri Feb 28 13:44:54 CET 2020


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, February 28, 2020 1:36 PM, Thomas Naumann <tom at chajuti.de> wrote:

> unfortunatly there is no independent third location

Are you physically located in one of the two datacenters? Then run it there.
Otherwise, run a QDevic at the same location from where you sit and manage the cluster.

If a datacenter loses connection, you want the location that you are still able to connect to to have quorum.
I mean: what good will it do if you have a running cluster with quorom which you are not able to connect to to manage?

Therefore, I suggest to run it at the same physical location as your desktop/laptop/office from which you manage the cluster.
If that is not possible, then I don't know how to prevent a possible split-brain situation during connection problems.

> On 2/28/20 9:48 AM, Aaron Lauterer wrote:
>
> > 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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