Looks like you're spinning up containers for each session (i tried killing vnc server to see what happens.. that session dies, but you can start a new one with

Looks like you're spinning up containers for each session (i tried killing vnc server to see what happens.. that session dies, but you can start a new one with a different ID. next, the 1TB disk you're providing is probably a bottle neck -- trying to create a 500gb file with dd. Will let you know how it goes.