Re: Question about Disaster Recovery Architecture Between Two Datacenters

[Gautier HUSSON <g.husson@liberasys.com>]

Hello,

My answers hereunder. I respond quick because it is a non paid service.
I invite you to contact an official partner to build the infrastructure 
that suits your need (as I am).

BR
Gautier Husson.


Le 18/06/2026 à 11:38, Iván Méndez Cairós a écrit :
> Hello,
>
> We would like to know whether the following Disaster Recovery scenario can be implemented with Proxmox VE and what would be the recommended architecture.
>
> Our environment consists of:
>
>
>    *   A primary datacenter with more than three Proxmox VE hosts connected to a SAN storage array.
>    *   A secondary datacenter with equivalent infrastructure (Proxmox VE hosts and a storage array).
>    *   Storage replication from the primary array to the secondary array.
>    *   Both datacenters are connected through a LAN network with very low latency and sufficient bandwidth, so network performance is not a concern.
>
> Our objective is to ensure business continuity in the event of a complete failure of the primary datacenter.
>
> In such a scenario, we would like the virtual machines to be started in the secondary datacenter with as much automation as possible and with minimal manual intervention.
>
> We would appreciate your guidance regarding the following points:
>
>
>    1.  Does Proxmox VE officially support this type of architecture?
yes
>    2.  Would you recommend a stretched cluster across both datacenters, or two independent Proxmox clusters?
stretched (QDevice on a 3rd site + primary and secondary datacenter have 
their own path to connect the QDevice) ==> HA will be automatic
>    3.  What are the requirements regarding quorum, fencing, HA, networking, and storage?
- same number of nodes both sides
- a QDevice in a 3rd location (can be > 5ms away)
- HA enabled on VMs + Node affinity for the 1st site
- ping < 5ms between ALL Proxmox nodes (QDevice does not matters)
- storage : SYNCHRONOUS replication
>    4.  Is it possible for Proxmox HA to automatically start the virtual machines in the secondary datacenter if the primary datacenter becomes completely unavailable?
yes
>    5.  What are the main limitations or considerations for this design?
None if all is respected. If a node is out of order for long time, you 
should rebalance vote numbers between DC 1 and 2.
>    6.  What would be the recommended Proxmox architecture and best practices to achieve an automated Disaster Recovery solution in this scenario?
>
> Any recommendations, documentation, or real-world deployment examples would be greatly appreciated.
Official Proxmox Training of course :-)