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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 CICSTS32.CICS.SDFHSAMP.
You can use the job in Figure 67 to create and initialize DFHOSD.
1 This entry is for an XRF system that is not associated with any other CICS
region, and does not require a related system identifier. This entry is suitable to use
with the XRF IVPs supplied with CICS and described in the CICS/MVS Installation
Guide.
//DEFOSD JOB accounting information,CLASS=A,
// MSGLEVEL=(1,1),MSGCLASS=A,NOTIFY=userid
//DEFDS EXEC PGM=IDCAMS
//DDNAME1 DD VOL=SER=volid,UNIT=SYSDA,DISP=SHR
//SYSPRINT DD SYSOUT=A
//SYSIN DD *
DELETE (’CICSTS32.DFHOSD’) PURGE CLUSTER
DEFINE CLUSTER (TRACKS(1,1) -
NAME (CICSTS32.DFHOSD) -
SHAREOPTIONS(2) -
VOLUMES (volid) -
FILE (DDNAME1)) -
DATA -
(RECORDSIZE(80,80) -
CONTROLINTERVALSIZE(2048) -
NAME (CICSTS32.DATA.DFHOSD) -
KEYS(12,0)) -
INDEX -
(NAME(CICSTS32.INDEX.DFHOSD)) -
/*
//INITOSD EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=A
//* COLUMN
//* 1 5 14 23 32 41
//* GN genappl relsysid ddnxrctl ddnxrmsg ind
//*
//SYS01 DD *
GN DBDCCICS CTLDBDC MSGDBDC 1
GN DBDCMRO1 MROSYS CTLMRO1 MSGMRO1 N 2
GN DBDCMRO2 MROSYS CTLMRO2 MSGMRO2
GN DBDCMRO3 MROSYS CTLMRO3 MSGMRO3
/*
//SYSIN DD *
REPRO INFILE ( SYS01 ) -
OUTDATASET (CICSTS32.DFHOSD)
/*
Figure 67. Sample job to create and initialize the DFHOSD data set
694 Customization Guide