Cluster and HA over WAN

[ayozeve]

Hello, I have been reading for a long time about the feasibility of being able to install a cluster of 3 servers in different locations linked together by VPN. And I suppose that it is highly inadvisable to establish a cluster connection with a latency of 60-70 ms. Does anyone have a similar setup in production? We want to add the nodes with zfs and replicated with zsync

This whole plan was because we intend to have a redundant system in which if a machine goes down, another one from the cluster of another office (all connected by VPN) gets up.

We have performed this procedure locally but never over the WAN. Ultimately, is it feasible? Thank you.

Regards

 

[sterzy]

Since Corosync needs latencies of under 2ms to establish a reliable cluster, creating a cluster with 60-70ms is at best unstable. You can read more about the network requirements needed to establish a cluster in the manual [1].

[1]: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#pvecm_cluster_network_requirements

 

[ayozeve]

Since Corosync needs latencies of under 2ms to establish a reliable cluster, creating a cluster with 60-70ms is at best unstable. You can read more about the network requirements needed to establish a cluster in the manual [1].

[1]: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#pvecm_cluster_network_requirements

Thank you very much I was reading the link you gave me and that's what I was afraid of. A practical and somewhat alternative I guess could be to use zsync but without being inside the cluster and thus allows us to pick up the machine in case the main one goes down. If someone had such an approach it would help me a lot because in the end I'm sure they've had the same concerns. First of all thank you very much for the help.

Regards