Definitions for channel-connected Db2 subsystems
When determining your channel-to-channel definitions, remember that MAXBFRU must be large enough to handle the largest PIU.
Because Db2 is sending 4096 bytes, you need enough 4KB buffers to accept 4096 + 29 bytes (the 29 bytes is for the network header). Thus MAXBFRU must be at least 2 in our example.
In many cases, the Db2 RU size is larger than any other PIUs used on existing CTCs, which can mean you must examine your MAXBFRU values on existing CTC definitions. If the values are too small, you get an SNA X'800A' sense code, indicating that the PIU was truncated during transmission.
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** CTC DEFINITIONS FOR SYSTEM 1 *
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DB1CTC VBUILD TYPE=CA CTC MAJOR NODE DEFINITION
DB1GRPB GROUP LNCTL=CTCA, CTCA LINE TYPE X
MIH=YES,REPLYTO=10.0
DB1CTCL LINE ADDRESS=(500), CTC ADDRESS FOR THIS LINE X
DELAY=0, CTC DELAY X
MAXBFRU=8, MAX BUFFER USED X
ISTATUS=ACTIVE INITIAL STATUS IS ACTIVE
DB1CTCP PU ISTATUS=ACTIVE***********************************************************************
** CTC DEFINITIONS FOR SYSTEM 2 *
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DB2CTC VBUILD TYPE=CA CTC MAJOR NODE DEFINITION
DB2GRPB GROUP LNCTL=CTCA, CTCA LINE TYPE X
MIH=YES,REPLYTO=10.0
DB2CTCL LINE ADDRESS=(500), CTC ADDRESS FOR THIS LINE X
DELAY=0, CTC DELAY X
MAXBFRU=8, MAX BUFFER USED X
ISTATUS=ACTIVE INITIAL STATUS IS ACTIVE
DB2CTCP PU ISTATUS=ACTIVE***********************************************************************
** PATH - NETWORK ROUTES FOR SYSTEM 1 *
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MVSDB2 PATH DESTSA=2,ER1=(2,1),VR1=1, X
VRPWS10=(2,30),VRPWS11=(2,30),VRPWS12=(2,30)
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** PATH - NETWORK ROUTES FOR SYSTEM 2 *
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MVSDB1 PATH DESTSA=1,ER1=(1,1),VR1=1, X
VRPWS10=(2,30),VRPWS11=(2,30),VRPWS12=(2,30)***********************************************************************
** CDRSC DEFINITIONS FOR SYSTEM 1 *
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VBUILD TYPE=CDRSC
DB2APPL CDRSC CDRM=DB2CDRM,ISTATUS=ACTIVE
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** CDRSC DEFINITIONS FOR SYSTEM 2 *
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VBUILD TYPE=CDRSC
DB1APPL CDRSC CDRM=DB1CDRM,ISTATUS=ACTIVE***********************************************************************
** CDRM DEFINITIONS FOR SYSTEM 1 AND 2 (SAME DEFINITION USED) *
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VBUILD TYPE=CDRM
DB1CDRM CDRM SUBAREA=1,ISTATUS=ACTIVE,CDRSC=OPT
DB2CDRM CDRM SUBAREA=2,ISTATUS=ACTIVE,CDRSC=OPT***********************************************************************
** ATCCONTA - NETWORK CONFIGURATION LIST FOR SYSTEM 1 *
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DB1PATH,DB1CTC,DB1RSC,DB1APPLS,DBCDRMS
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** ATCCONTB - NETWORK CONFIGURATION LIST FOR SYSTEM 2 *
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DB2PATH,DB2CTC,DB2RSC,DB2APPLS,DBCDRMS