def worker_disk(mig_data):
                vm = mig_data.vms[0]
                session = vm.wait_for_login(timeout=self.login_timeout)

                utils_misc.install_disktest_on_vm(test, vm, self.disk_srcdir,
                                                  self.install_path)

                cmd = ("nohup %s/disktest -m %s -L -S > %s &" %
                       (os.path.join(self.install_path, "disktest", "src"),
                        self.disk_usage, self.disktest_out))
                logging.debug("Sending command: %s" % (cmd))
                session.sendline(cmd)
                if session.cmd_status("killall -s 0 disktest") != 0:
                    disk_out = ("\n cpuflags_test_output: \n" +
                                session.cmd_output("cat %s" %
                                                   (self.disktest_out)))
                    raise error.TestFail("Something wrong happend"
                                         " during migration disktest"
                                         " should be running all time"
                                         " during this test.\n%s" % (disk_out))
            def worker_disk(mig_data):
                vm = mig_data.vms[0]
                session = vm.wait_for_login(timeout=self.login_timeout)

                utils_misc.install_disktest_on_vm(test, vm, self.disk_srcdir,
                                                       self.install_path)

                cmd = ("nohup %s/disktest -m %s -L -S > %s &" %
                           (os.path.join(self.install_path, "disktest", "src"),
                            self.disk_usage,
                            self.disktest_out))
                logging.debug("Sending command: %s" % (cmd))
                session.sendline(cmd)
                if session.cmd_status("killall -s 0 disktest") != 0:
                    disk_out = ("\n cpuflags_test_output: \n" +
                                      session.cmd_output("cat %s" %
                                                 (self.disktest_out)))
                    raise error.TestFail("Something wrong happend"
                                         " during migration disktest"
                                         " should be running all time"
                                         " during this test.\n%s" %
                                         (disk_out))