I came here to say the same thing: “telefork” is just a much more limited version of VMWare’s VMotion. FT is, IIRC, just an extension of the same technique. You

I came here to say the same thing: “telefork” is just a much more limited version of VMWare’s VMotion. FT is, IIRC, just an extension of the same technique. You’re basically just continuously monitoring and copying state over to the other host instead of shutting down the original VM after you’re done copying. Essentially ESX is an OS that can already a full on telefork with its “process” being a VM. You can practically get to that state if your VM is made super lightweight. (Source: I used to work at VMWare and one of the implementers of FT was a cycling buddy.)