s4u::Disk* get_iface() { return &piface_; }
s4u::Host* get_host() const { return host_; }
void set_host(s4u::Host* host) { host_ = host; }
s4u::Disk* get_iface() { return &piface_; }
s4u::Host* get_host() const { return host_; }
void set_host(s4u::Host* host) { host_ = host; }