Subsystem monitoring with monitoring job variables

Subsystems can be monitored with monitoring job variables (MONJV). The MONJV must be specified in the START-SUBSYSTEM command. DSSM administers and sets the MONJV during the entire subsystem runtime until it is shut down, with:

• explicit DSSM calls (/HOLD-SUBSYSTEM, /RESUME-SUBSYSTEM, /STOP-SUBSYSTEM, /UNLOCK-SUBSYSTEM)

• implicit operations (subsystem, automatic restore ...)

• SHUTDOWN

The MONJV indicates whether the subsystem is active, stopped, interrupted or locked. The MONJV can have the following contents:

Byte	Length	Contents	Values
1	3	Status	$R (running) / $A (abnormal end) / $L (loaded) / $T (terminate)
4	1	Reserved	0
5	4	TSN	???? (four question marks)
9	4	Home Catid
13	4	Reserved
17	1	Type	J / P / S
18	53	Reserved
71	3	Session number
74	8	Name of the subsystem
82	7	Version of the subsystem
89	15	Condition of the subsystem	for $R: created for $A: abnormal end / locked for $L: in create for $T: not created / not resumed / in delete / in resume / in hold
104	24	Unused
128	127	Reserved for subsystem users