IBM-supplied default start option list

ATCSTR00 is the default start option list supplied by IBM®. It initializes VTAM® as a subarea node. For this list to take effect when you start VTAM, you must copy it out of the GENDECK data set in SYS1.ASAMPLIB and put that copy in the SYS1.VTAMLIB, the VTAM definition library.

Guideline: The values specified in ATCSTR00 are not necessarily the default values for the start options listed there. If ATCSTR00 is the only start option list you use for a particular node, that node will be initialized as a subarea VTAM node.

The CACHETI start option defines the number of minutes that routing information about a previous locate search is stored. The default is 8 minutes. The range of permissible values is 0-1440 minutes.

The CMPVTAM start option specifies the maximum compression level allowed for sessions involving the host's application programs. CMPVTAM=0 indicates that no compression is allowed.

The HOTIOTRM start option specifies the percentage of the current size of the IO buffer pool that a single LU-LU session must have allocated to it to cause VTAM to automatically terminate all sessions between the two logical units. HOTIOTRM=0 (the default value) indicates that VTAM will not terminate sessions based on IO buffer pool usage.

The SRCHRED start option allows you to specify whether this node can reduce searches for resources which are found to be unreachable. SRCHRED=ON indicates that search reduction is to be performed. You can change the SRCHRED value with the MODIFY VTAMOPTS command while VTAM is running.

If you specify SRCHRED=ON, you can use the SRCOUNT start option to specify how many search requests must be limited before VTAM performs another resource discovery search. The default value is 10 search requests.

In addition, if search reduction has been specified, you can specify the number of seconds during which VTAM does not conduct searches for an unreachable resource by specifying the SRTIMER start option. The default value is 30 seconds.

For a specific cross-domain resource or group of cross-domain resources, the values on the SRTIMER and SRCOUNT start options are overridden by the values on the SRTIMER and SRCOUNT operands of the CDRSC definition statement. See Eliminating and reducing searches for unavailable resources.

The SSCPDYN start option specifies whether VTAM dynamically adds entries to the adjacent SSCP table. SSCPDYN=YES (the default value) specifies that VTAM adds a new entry to a cross-domain resource's adjacent SSCP table whenever it receives a session initiation request from the resource through an SSCP that is not already in the table.

The SSCPORD start option specifies whether VTAM, when establishing sessions, searches the adjacent SSCP table in priority order (the default value) or in the order in which the table is defined. SSCPORD=PRIORITY specifies that VTAM gives priority to the SSCP that owns the destination LU (if known), then to SSCPs for which the most recent session attempt succeeded. The combination of SSCPORD=PRIORITY and SSCPDYN=YES gives you the greatest flexibility for setting up routes across networks, and, if your adjacent SSCP table is large, it gives you the best performance during session setup.

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 allows 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.

The SIZE option for the VTAM internal trace specifies the number of pages in the internal trace table. The default SIZE option value has been increased to 100 pages, starting with VTAM V4R3.

*  =====> BEGINNING OF DATA SET ATCSTR00
**********************************************************************
*   ATCSTR00 - VTAM START LIST FOR A SUBAREA NODE - DEFAULT LIST     *
**********************************************************************
         ALSREQ=NO,                  ** ADJ LINK STAT IN ALS LIST    **X
         ASYDE=TERM,                 ** ASYNCH DEVICE SESSION TERM   **X
         BSCMDRS=(STATS,INOPS),      ** REPORT BISYNC INOP STATS     **X
         CACHETI=8,                   ** CACHE TIMER VALUE           **X
         CDRSCTI=480,                ** DYNAMIC CDRSC INTERVAL       **X
         CMPVTAM=0,                  ** MAX HOST APPL COMPRESSION    **X
         COLD,                       ** CONFIG RESTART STATUS        **X
         CSALIMIT=0,                 ** MAXIMUM CSA LIMIT            **X
         CSA24=0,                    ** 24 BIT ADDR STORAGE LIMIT    **X
         DATEFORM=MDY,               ** AUTO IPL DATE FORM           **X
         DLRTCB=32,                  ** NCP DUMP/LOAD/RESTART TCBS   **X
         DYNASSCP=YES,               ** DYNA SESS REQ ROUTE TO ADJS  **X
         DYNLU=YES,                  ** DYNAMIC DLU CAPABILITY       **X
         ENCRYPTN=NO,                ** APPL ENCRYPTION CAPABILITY   **X
         GWSSCP=YES,                 ** GATEWAY SSCP CAPABILITY      **X
         HOTIOTRM=0,                 ** HOT I/O TERMINATION          **X
         IOINT=180,                  ** OUTSTANDING RESPONSE DISPLAY **X
         MAXSUBA=15,                 ** HIGHEST SUBAREA VALUE        **X
         MSGMOD=NO,                  ** VTAM MODULE MESSAGE DISPLAY  **X
         NCPBUFSZ=512,               ** NCP LOAD/DUMP RU SIZE        **X
         NMVTLOG=NPDA,               ** NMVT RECORDING               **X
         NODELST=NODEDS1,            ** WARM RESTART NODE LIST       **X
         PPOLOG=NO,                  ** PPO LOG RECORDING            **X
         PROMPT,                     ** START OPTIONS PROMPT         **X
         SDLCMDRS=(STATS,INOPS),     ** REPORT SDLC INOP STATS       **X
         SONLIM=(60,30),             ** IO BUF % FOR SESS OUT NOTIFY **X
         SRCHRED=ON,                 ** PERFORM SEARCH REDUCTION     **X
         SRCOUNT=10,                 ** SEARCH REDUCTION COUNT LIMIT **X
         SRTIMER=30,                 ** SEARCH REDUCTION TIME LIMIT  **X
         SSCPDYN=YES,                ** DYNAMIC ADD ENTRY TO ADJSSCP **X
         SSCPORD=PRIORITY,           ** ADJSSCP SEARCH ORDER         **X
         SUPP=NOSUP,                 ** VTAM MESSAGE CLASS SUPPRESS  **X
         TNSTAT,TIME=60,             ** TUNING STATISTICS            **X
         VFYRED=YES,                 ** LU 6.2 VERIFICATION REDUCTION**X
         XNETALS=YES,                ** NON NATIVE NET CONNECTIVITY  **X
         TRACE,TYPE=VTAM,MODE=INT,OPT=NONE,SIZE=100,                   X
         USSTAB=ISTINCNO,            ** VTAM MESSAGE & COMMAND TABLE **X
         APBUF=(16,,2,,1,3),         ** 24 BIT CSA BUFFER            **X
         BSBUF=(100,,0,,25,60),      ** BOUNDARY LU SESSION BUFFER   **X
         CRPLBUF=(100,,0,,1,29),     ** APPL REQUEST BUFFER          **X
         IOBUF=(100,384,5,,1,30),    ** PIU INPUT/OUTPUT BUFFER      **X
         LFBUF=(25,,0,,1,1),         ** ACTIVE APPL BUFFER EAS < 30  **X
         LPBUF=(70,,0,,5,1),         ** ACTIVE VTAM PROCESS BUFFER   **X
         SFBUF=(51,,0,,1,1),         ** ACTIVE APPL BUFFER EAS >= 30 **X
         SPBUF=(10,,0,,1,1),         ** LARGE MESSAGE REQUEST BUFFER **X
         XDBUF=(6,,0,,1,5)           ** XID EXCHANGE PROCESS BUFFER  **
*  =====> END OF DATA SET ATCSTR00