Quiesce / shutdown signal in z/VSE
Ingolf24 120000DRN3 Visits (1176)
Are you aware of the signal quiesce / shutdown support in z/VSE ? This support is available since z/VSE Version 4. z/VSE doesn't have a controlled shutdown process, but you may implement that e.g. with REXX procedures to your needs und use the quiesce support to trigger the shutdown.
The signal quiesce support can be used to inform a z/VSE image, that shutdown is requested. See more details below:
To configure z/VSE for signal quiesce, you use the QUIESCE parameter of the IPL SYS control statement.
If a disruptive operation (for example, an IML or IPL) is performed via a Service Element (SE) or Hardware Management Console (HMC) panel, the SE or HMC will generate a signal-quiesce event. Under z/VM, a signal-quiesce event can be triggered for a guest using a z/VM SIGNAL SHUTDOWN command. The signal-quiesce event instructs an active z/VSE to quiesce (stop) processing:
When a signal-quiesce event is received, z/VSE issues message 0W01D:
0W01D DO YOU WANT TO CONTINUE SYSTEM SHUTDOWN (WILL BE FORCED AFTER TIMEOUT)?
If the operator replies "YES", the system will enter a disabled-wait state and set a unique hard-wait code.
Signal quiesce is designed to be mainly used with console automation programs, which can initiate a controlled system shutdown as a response to message 0W01D.
More details about the IPL SYS QUIESCE is documented in the z/VSE System Control Statements book. You may download it from here.
Thanks to our information development team, I copied the above from the z/VSE Knowledge Center - here.
Have a good weekend.