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Chapter 22. The extended recovery facility overseer program
The information in this chapter is of interest only to users of the extended recovery
facility (XRF). Details of XRF are provided in the
CICS/ESA 3.3 XRF Guide
.
Guidance information about running the overseer, including a sample job stream, is
provided in the
CICS Operations and Utilities Guide
.
The XRF overseer program has two major functions:
v To display the current status of active and alternate CICS regions
v To restart failed CICS regions in place without operator intervention.
There is a CICS-supplied sample overseer program that performs these two
functions and which you may find adequate for your installation.
The chapter is divided into the following sections:
1. “The sample overseer program” contains:
v “The functions of the sample program”
v “How the sample overseer program interfaces with CICS” on page 613
v “How to tell the overseer which actives and alternates to monitor” on
page 613.
2. “The DFHWOSM macros” on page 614 describes the macros that you use to
provide services to the overseer program.
3. “Customizing the sample overseer program” on page 623 describes how
you can extend the functions of the sample program.
The sample overseer program
The CICS-supplied sample overseer is an assembler-language batch program that
runs in its own address space. The source of the sample program is in four
members of CICSTS13.CICS.SDFHSAMP:
v DFH$AXRO
v DFH$AGCB
v DFH$ADSP
v DFH$ARES.
The associated DSECTs are supplied in DFH$XRDS in the same library. An
assembled version of the sample program is supplied in
CICSTS13.CICS.SDFHLOAD.
The functions of the sample program
The program acts on five commands entered by the console operator. (Minimum
abbreviations are shown like this: D.) The commands are as follows:
Display
to display the current status of all active-alternate pairs being monitored by the
overseer program
Restart
to enable or disable the restart-in-place function of the overseer program
© Copyright IBM Corp. 1977, 1999 609