There are many roads to achieving HA with Proxmox. The ideal one requires:
3 servers with identical CPUs
Redundant boot disk in each server
Redundant network in each server
Redundant network switching
HA shared storage
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
3 servers with identical CPUs
Redundant boot disk in each server
Redundant network in each server
Redundant network switching
HA shared storage
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
In general the answer is No.
Proxmox clustering technology requires very low latency network to be stable. Unless you have dark fiber with sub few millisecond latency between the sites, you will not be successful in establishing a stable PVE cluster.
There are some 3rd party solutions that exist to provide a single pane of glass management, and its on a roadmap for PVE but does not exist in the product today.
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
Proxmox clustering technology requires very low latency network to be stable. Unless you have dark fiber with sub few millisecond latency between the sites, you will not be successful in establishing a stable PVE cluster.
There are some 3rd party solutions that exist to provide a single pane of glass management, and its on a roadmap for PVE but does not exist in the product today.
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
"site" can mean different things to different people. One could have two "sites" in two cabinets located across each other. Or it could be two buildings connected via 100G link, 200 feet apart.
If you provide minimal information in your query, you can only get high level theoretical answers that would be hedged on a side of caution.
What you need to understand is PVE cluster is using TCP/IP for communication. Theoretically you can create a cluster across multiple continents as long as there is TCP/IP routing. It does not mean its a suggested or supported setup.
Even if your latency is very high, you can research Corosync product which PVE uses, and increase the timeouts to extremely high values. Again, its at your own risk and likely not something that PVE developers will agree to support.
Two members is not a supported configuration for Corosync based clusters. You need at least 3.
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
Just add the host via UI, but be careful if the latency goes to high, unexpected node reboots might happen.