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each active-alternate pair. You create this data set and initialize it with information
about active-alternate pairs before you use the overseer for the first time. You also
have to redefine the DFHOSD data set whenever you want to change the
information that it holds. CICS provides a sample job stream that you can use to:
v Delete and define the DFHOSD data set
v Initialize the DFHOSD data set with information about sample active-alternate
pairs
v Execute the overseer code and the sample overseer program.
The sample job stream is called DFHIVXRO and is in CICSTS13.CICS.INSTLIB.
Guidance information about this sample job stream is provided in the
CICS
Operations and Utilities Guide
.
The sample overseer program reads the DFHOSD records in key sequence and
builds a table of entries. Each active-alternate pair is known by its generic applid on
this data set. Every entry on the data set contains the following information:
v A 12-byte key field, containing the 4-byte value ‘GNbb’ followed by the 8-byte
generic applid of the active-alternate pair.
v The ddnames of the control data set and the message data set associated with
this generic applid. Each of these is an 8-byte value.
v An optional 8-byte RELATEID, to identify related systems.
v A restart-in-place indicator to show whether a region can be restarted in place.
The only value that prevents an attempt to restart in place is ‘N’.
The data structure of the DFHOSD data set entries is provided in member
DFH$XRDS of CICSTS13.CICS.SDFHSAMP.
For a sample of the job log from an overseer job, refer to the
CICS Operations and
Utilities Guide
.
The DFHWOSM macros
The DFHWOSM macros invoke the CICS module DFHWOS to provide services to
the overseer program. The macros are the supported interface to the CAVM data
sets, and are supplied to perform the following functions:
DFHWOSM FUNC=BUILD
Open communication with DFHWOS
DFHWOSM FUNC=CLOSE
Terminate access to the CAVM data sets for a named generic applid
DFHWOSM FUNC=DSECT
Generate required DSECTs
DFHWOSM FUNC=JJC
Issue a JES cancel for a named job
DFHWOSM FUNC={JJS|QJJS}
Discover current JES JOB status
DFHWOSM FUNC=OPEN
Initialize access to the CAVM data sets for a named generic applid
DFHWOSM FUNC=OSCMD
Issue MVS commands
the XRF overseer program
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CICS TS for OS/390: CICS Customization Guide