Not a proxmox user but that's certainly where I'd go, if I was: write to memory via an fs abstraction, get data off into another place via network if you need i

Not a proxmox user but that's certainly where I'd go, if I was: write to memory via an fs abstraction, get data off into another place via network if you need it. There's also the noatime flag, for unavoidable writes to local disk: avoid the update to dir stat() state if you can.