Is it possible to set up an analogue of VMware Fault Tolerance on Proxmox?

Question

Xen

So, the point is - there are 2 rack servers and 1 workstation. A virtual machine (Windows Server 2008 R2) is installed on the server, to which information is received from an industrial controller, it is necessary to assemble a hot backup system so that in the event of a hardware failure of server No. 1, server No. 2 receives control of the virtual machine without loss of RAM and the client part on The ARM didn't even notice the change (idle <= 5 seconds).
Options for using VMware Faulr Tolerance technology were worked out, but they ran into the need for a common balls for storing VM configuration files, the solutions came down to:
- hardware storage system (SHD), a very biting price tag, because you can’t buy a cheap option, it is storage in this situation that is the most vulnerable part of the system;
- a small server with Windows Server OS and setting up shared NFS balls as a storage system. As a result, the security of the system goes down the drain, and it’s not worth it to do so.
- virtual storage system VMware Storage Appliance, seems to solve the issue of common balls, but is no longer for sale.
As a result, even if the issue with storage is solved, the price tag of only VMware packages exceeds $16k, which is inappropriate.
At the moment, redundancy using the drbd-mirror technology on the Proxmox virtualization management system is being considered, due to its free of charge and the availability of developments. BUT this guarantees only High-Availability, ie. protection of data on hard drives, as a result, the loss of time is equal to the boot time of the VM, which is unacceptable.
QUESTION!is it possible to organize some kind of hot backup technology, without turning off the VM, like Fault Tolerance using DRBD and Proxmox?
update 1:
Taking into account the comment of Puma Thailand Puma Thailand :

there is a similar vmware functionality in xen, I'm not sure if it's free, but I think it's cheaper.

the question arises, what if you need to use Windows Server as a guest OS? After all, as far as I understand, Xen is written in the kernel of the guest OS and requires open-source code from it. And if you still have to build a virtual Windows Server based on guest Linux using the same VirtualBox, then what product can produce an analogue of a hot standby from VMware Fault Tolerance? My attempts to find were unsuccessful, or I just...was looking for(

Answer 1

there is a similar vmware functionality in xen, I'm not sure if it's free, but I think it's cheaper.
there is no high availability with live migration in the proxomx itself, it simply restarts the machine on the second node if the first one has died, you need to dig separately kvm

Answer 2

In Proxmox, you must have a cluster set up, after which you can enable the HA option. With its help, it will be possible to reserve a VM. You can read more here . However, I do not presume to say that if one node completely fails, then a complete reboot of the controlled machine on the other node will not be required.