[PVE-User] HA Failover if shared storage fails on one Node

Martin Holub martin at holub.co.at
Wed Oct 17 13:33:16 CEST 2018


We have dedicated Links for the Storage and the Cluster Communication,
so if only the Storage Links fail Corosync is still working. Maybe i
need to create some Watchdog myself for that specific case, but let's
wait if there is really nothing in Proxmox to handle that Scenario.


On 10/17/18 1:29 PM, Mark Adams wrote:
> What interface is your cluster communication (corosync) running over? As
> this is the link that needs to be unavailable to initiate a VM start on
> another node AFAIK.
> Basically, the other nodes in the cluster need to be seeing a problem with
> the node. If its still communicating over the whichever interface you have
> the cluster communication on then as far as it is concerned the node is
> still up. If you just lose access to your storage, then your VM will still
> be running in memory.
> I don't believe there is any separate storage specific monitoring in
> proxmox that could trigger a move to another node. If there is I'm sure
> someone else on the list will advise.
> Regards,
> Mark
> On Wed, 17 Oct 2018 at 12:19, Martin Holub <martin at holub.co.at> wrote:
>> On 10/17/18 1:11 PM, Gilberto Nunes wrote:
>>> Hi
>>> How about Node priority?
>>> Look section 14.5.2 in this doc
>>> https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_configuration_10
>>> ---
>>> Gilberto Nunes Ferreira
>>> (47) 3025-5907
>>> (47) 99676-7530 - Whatsapp / Telegram
>>> Skype: gilberto.nunes36
>>> Em qua, 17 de out de 2018 às 08:05, Martin Holub <martin at holub.co.at>
>>> escreveu:
>>>> Hi,
>>>> I am currently testing the HA features on a 6 Node Cluster and a NetAPP
>>>> Storage with iSCSI and multipath configured on all Nodes. I now tried
>>>> what happens if, for any reason, booth Links fail (by shutting down the
>>>> Interfaces on one Blade). Unfortunately, altough i had configured HA for
>>>> my Test VM, Proxmox seems to not recognize the Storage outtage and
>>>> therefore did not migrate the VM to a different blade or removed that
>>>> Node from the Cluster (either by resetting it or fencing it somehow
>>>> else). Any hints on how to get that solved?
>>>> Thanks,
>>>> Martin
>> Not shure if i understood what you mean with that reference, but since
>> Proxmox does not detect that the Storage is unreachable on that specific
>> Cluster Node, how are HA Groups supposed to work around this?
>> Best,
>> Martin
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