[pve-devel] Two-Node HA

Thomas Lamprecht t.lamprecht at proxmox.com
Wed Sep 28 15:46:55 CEST 2016


Hi,

QDisks are not ideal and those itself will probably not supported by Proxmox
VE, also I would really love top see the term "two node HA" vanish, as its
only marketing talk and is technically simply not possible (sadly basic
rules of our universe make it impossible), they call a setup with three
voters (the two nodes + the storage node) two node HA to sound better...

That said, rant aside, there are plans to add the corosync (our cluster
communication stack) QDevice daemon which allows then qdevices (at the
moment there is only QNetd) to provide votes for one or more cluster.

This QNetd device may run on a non Proxmox VE node and uses TCP/IP to
communicate with the cluster.

So you can have a two node cluster, setup the qdevice daemon there and the
qnetd daemon on your storage box which then provides the third vote needed
to allow recovery on a failure of one of the two Proxmox VE nodes.

Patches for this are already on the list, whats mainly missing is -
obviously - reviewing them and documentation of this all (which I'm doing
atm).

cheers,
Thomas


On 09/28/2016 03:26 PM, Andreas Steinel wrote:
> Hi,
>
> I'd like to ask if there are any plans to use e.g. the shared storage
> as a quorum/voting disk like the oracle grid infrastructure uses it to
> get a two node ha cluster (for almost a decade). This obviously only
> works for NAS or SAN storage.
>
> Best,
> Andreas
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