Migration data host start option list

A migration data host (MDH) combines the function of an end node with the function and role of a subarea data host. It resides on the border of an APPN network and a subarea network. For more information about migration data hosts, see the z/OS Communications Server: SNA Network Implementation Guide.

The example that follows illustrates the start list for A01. The combination of NODETYPE=EN and the HOSTSA start option, as shown, defines this node as a migration data host (MDH). CPCP=YES allows this end node to activate CP-CP sessions with an adjacent network node, acting as the end node's network node server. The end node is permitted to activate CP-CP sessions with only one adjacent network node (its network node server) at a time.

NETID, SSCPID, and SSCPNAME are required start options. HOSTPU is not required; however, it is recommended if you are using NetView®. The CONFIG start option identifies a unique name of the configuration list to be activated when VTAM® starts.

The CINDXSIZ start option specifies the maximum size of the CID and CONVID index tables. The new default value is 8176 bytes.

DYNLU=YES enables dynamic definition of independent LUs by using CDRSC definitions.

The HPR start option specifies the level of HPR support provided by VTAM. HPR=RTP indicates that this migration data host provides RTP-level HPR support, meaning that it can be the endpoint of an HPR route. RTP is the default HPR value for migration data hosts.

GWSSCP=NO should always be coded for migration data hosts. If it is not, the node will come up successfully, but an error message will be issued.

MSGLEVEL=V4R2 specifies that VTAM issues the V4R2 version of messages listed in z/OS Communications Server: SNA Messages.

The SORDER start option controls the order in which the APPN and subarea networks are searched when a search request for an unknown LU is received at this node from the subarea network. SORDER=APPN (the default value) specifies that the APPN network is to be searched first. The user can specify that the subarea network is to be searched first (SORDER=SUBAREA).

The VERIFYCP start option is used to specify whether VTAM is to perform LU-LU session-level verification during activation of LU 6.2 sessions involving control points. VERIFYCP=NONE specifies that no verification of the partner LU's identity is to take place during session activation.

The VFYRED start option specifies whether the node should attempt to perform resource verification reduction. VFYRED=YES indicates that LU 6.2 session initiation requests do not need to be delivered to the target LU. Using the VFYRED start option might allow you to significantly reduce directed verification searches. For more information about the VFYRED start option, see the z/OS Communications Server: SNA Network Implementation Guide and the z/OS Communications Server: SNA Resource Definition Reference.

VRTG=YES indicates that a VR-based transmission group connection is to be activated whenever SSCP-SSCP sessions are established for this node. Because both the NODETYPE and HOSTSA start options were used, VRTGCPCP=YES, indicating that CP-CP sessions are supported over VR-based transmission groups, is taken as the default.

SRCHRED=ON specifies that this node reduces searches for resources which are found to be unreachable. The default value for SRCHRED is OFF.

SRCOUNT=100 specifies that requests for a resource are to be limited to 100 before VTAM attempts to locate the resource again. SRCOUNT is meaningful only if search reduction is active. The default value for SRCOUNT is 10.

SRTIMER=1000 specifies that VTAM will not conduct a search for an unreachable resource until 1000 seconds have elapsed.

ENHADDR=YES specifies that VTAM can assign element addresses greater than 65 535 for PLUs.

The TRACE,TYPE=VTAM,OPT=ALL start option indicates that all VTAM internal trace options should be started. A new internal trace option, OPTION=CFS, has been added for the generic resources function.
*  =====> BEGINNING OF DATA SET ATCSTRV1
***********************************************************************
*   ATCSTRV1 - VTAM START LIST FOR A MIGRATION DATA HOST NODE - A01N *
**********************************************************************
SSCPID=010001,            HOST ID                                      X
MSGLEVEL=V4R2,            VTAM V4R2 VERSION OF VTAM MESSAGES           X
SORDER=APPN,              APPN NETWORK SEARCHED FIRST                  X
MSGMOD=NO,                DO NOT IDENTIFY MESSAGE-ISSUING VTAM MODULE  X
SSCPNAME=A01N,            HOST NAME                                    X
CONFIG=01,                START CONFIG                                 X
CINDXSIZ=8176,            CIT & CONVT INDEX TABLE SIZE                 X
NETID=NETA,               IN NETA                                      X
NQNMODE=NQNAME,           FULLY QUALIFIED NAMES USED                   X
NODETYPE=EN,              END NODE                                     X
HOSTSA=01,                SUBAREA HOST NUMBER                          X
GWSSCP=NO,                SSCP CAN NOT BE A GATEWAY SSCP               X
DYNLU=YES,                DYNAMIC LU                                   X
HPR=RTP,                  HPR CAPABILITY                               X
VRTG=YES,                 VIRTUAL ROUTE-BASED TRANSMISSION GROUPS      X
SRCHRED=ON,               SEARCH REDUCTION FOR UNREACHABLE RESOURCES   X
SRCOUNT=100,              SEARCH REDUCTION RESOURCE REQUEST LIMIT      X
SRTIMER=1000,             SEARCH REDUCTION TIME LIMIT                  X
TRACE,                    VTAM INTERNAL TRACE OPTIONS                  X
TYPE=VTAM,                                                             X
OPT=ALL,                  ALL INTERNAL TRACE TYPES STARTED             X
SIZE=500,                 NUMBER OF PAGES IN INTERNAL TRACE TABLE      X
VFYRED=YES,               LU 6.2 VERIFICATION REDUCTION                X
XNETALS=YES,              ALLOWS CONNECTION TO ADJACENT NETWORKS       X
ENHADDR=YES,              CAN USE HIGH ORDER ELEMENT ADDRESSES FOR PLUSX
CPCP=YES,                 CP-CP SESSION                                X
DYNADJCP=YES,             DYNAMIC ADJACENT CP (DEFAULT)                X
VERIFYCP=NONE,            VERIFY CP (DEFAULT)                          X
CRPLBUF=(200),            PAGEABLE RPL POOL                            X
LFBUF=(100,,10,,10,33),   FIXED LARGE BUFFER POOL                      X
LPBUF=(64,,4,,4,22),      PAGEABLE LARGE BUFFER POOL                   X
SFBUF=(60),               FIXED SMALL BUFFER POOL                      X
SPBUF=(32)                PAGEABLE SMALL BUFFER POOL
*  =====> END OF DATA SET ATCSTRV1