z/VM® Guest Coupling simulation support does not support or simulate Sysplex Timers (ETR). When running in a z/VM environment, all virtual machine Time-of-Day (TOD) clocks are synchronized with the system TOD clock. This implicit synchronization allows all MVS™ images running in a sysplex on z/VM to have identically set TOD clocks without the use of a Sysplex Timer. To inform MVS that clock synchronization will be done by z/VM, you must either modify the CLOCK00 parmlib member or create a new CLOCKxx member for running under z/VM. Otherwise, you will not be able to run in sysplex mode with multiple MVS images. Only Monoplex mode will be supported.

Figure 1 shows a sample CLOCKxx member required to run a sysplex under z/VM.

TIMEZONE W.04.00.00
ETRMODE YES
ETRDELTA 10
ETRZONE YES
SIMETRID 00