JES2 allows an installation to specify a different VTAM® log–mode table entry for each node. The installation specifies the entry to use on the LOGMODE= parameter on the NODE(nnnn) or APPL(xxxxx) initialization statement. If you include both statements, VTAM uses the entry specified on the APPL(xxxxx) initialization statement for the node to locate the corresponding log mode entry. Figure 1 shows the relationship between the APPL(xxxxx) statement and the log mode entries.

         $SN,A=NODEB               $SN,A=NODEB
NODEA───────────────────→NODEB←───────────────────────NODEC
  │      OPNDST            │       OPNDST               │
  │                        │                            │
┌─┴───────────────────┐    │        ┌───────────────────┴─┐
│JES2 Init statements │    │        │JES2 Init statements │
│APPL(NODEB)          │    │        │APPL(NODEB)          │
│     LOGMODE=NJEMODEA│    │        │     LOGMODE=NJEMODEC│
└─────────────────────┘    │        └─────────────────────┘
                           │
               ┌───────────┴─────────────┐
               │VTAM at NODEB locates the│
               │following entries:       │
               │                         │
               │- For NODEA, NJEMODEA    │
               │                         │
               │- For NODEC, NJEMODEC    │
               └─────────────────────────┘

If you determine that specifying different log modes for adjacent nodes can improve your network performance, specify the value for the log–mode table entry for the adjacent nodes on the LOGMODE= parameter on either the NODE(nnnn) or APPL(xxxxx) initialization statement.

If you do not specify the LOGMODE= parameter on a JES2 initialization statement, the default log–mode table entry name is specified on the DLOGMOD= parameter of the VTAM APPL statement at each node.