IBM Support

XCF connection INOP

Troubleshooting


Problem

The following message appears indicating that VTAM has detected an INOP for the specified device.  The completion code of X´0044´ in the sense code 80100044 indicates a soft INOP:
EZZ4310I ERROR: CODE=80100044 REPORTED ON DEVICE PWCDRM01. DIAGNOSTIC CODE: 00
The connection is inoperative but recovery of the connection is possible.

Cause

This problem is a result of an inadequate amount of XCF buffers and can cause the  unexpected XCF outages (INOPs).   XCF messages must be completed within the required time-out period.  The following display of the XCF major node shows that the PU is in INOP status:
DISPLAY NET,ID=ISTLSXCF,SCOPE=ALL
IST097I  DISPLAY  ACCEPTED
IST075I  NAME = ISTLSXCF         , TYPE = LCL SNA MAJ NODE
IST486I  STATUS= ACTIV     , DESIRED STATE= ACTIV
IST084I  NETWORK RESOURCES:
IST1316I  PU NAME = ISTPY1Q1  STATUS = IINOP---X-  TRLE = ISTTY1Q1 
IST1500I  STATE TRACE = OFF
IST314I END  
The display of XCF (D XCF,CD,CLASS=ALL) shows many NOBUFF conditions.
You will see VTAM messages similar to the following:
IST1494I  PATH SWITCH STARTED   FOR RTP CNR00005                        
IST1818I  PATH SWITCH REASON: SHORT REQUEST RETRY LIMIT EXHAUSTED       
IST314I  END                                                            
IST1494I  PATH SWITCH STARTED   FOR RTP CNR00001                        
IST1818I  PATH SWITCH REASON: SHORT REQUEST RETRY LIMIT EXHAUSTED       
IST314I  END                                                            
IST1494I  PATH SWITCH COMPLETED FOR RTP CNR00001                        
IST1480I  RTP END TO END ROUTE - RSCV PATH                              
IST1460I  TGN  CPNAME             TG TYPE      HPR                      
IST1461I   21  PWNET.PWCDRM03     APPN         RTP                      
IST314I  END                                                            
IST1504I  XCF CONNECTION WITH PWNET.PWCDRM03    IS INOPERATIVE         
IST1501I  XCF TOKEN = 0100000700190001                                     
IST1578I  DEVICE INOP DETECTED FOR ISTTQ1Y1 BY ISTTSCBX CODE = 001   
IST314I  END                                                               
IST1578I  SOFT   INOP DETECTED FOR ISTTQ1Y1 BY ISTTSC8X CODE = 005       
IST1196I  APPN CONNECTION FOR PWNET.PWCDRM03    INACTIVE - TGN =  21
IST1494I  PATH SWITCH STARTED   FOR RTP CNR00001                           
IST1819I  PATH SWITCH REASON: TG INOP                                      
IST314I  END                                                               
IST1494I  PATH SWITCH STARTED   FOR RTP CNR00004                           
IST1819I  PATH SWITCH REASON: TG INOP                                      
IST314I  END                                                               
IST1494I  PATH SWITCH STARTED   FOR RTP CNR00003                           
IST1819I  PATH SWITCH REASON: TG INOP                                
IST314I  END                                                               
IST1494I  PATH SWITCH FAILED    FOR RTP CNR00001                           
IST1495I  NO ALTERNATE ROUTE AVAILABLE                                     
IST314I  END                                                              
IST259I  INOP RECEIVED FOR ISTPQ1Y1 CODE = 01 
IST1141I  VARY INACT FOR ISTPQ1Y1          OVERRIDDEN BY HARD INOP        
IST1416I  ID = ISTPQ1Y1          FAILED - RECOVERY IN PROGRESS            
IST1136I  VARY INACT ISTPQ1Y1          SCHEDULED - UNRECOVERABLE ERROR    
IST1097I  CP-CP SESSION WITH PWNET.PWCDRM03    TERMINATED                 
IST1280I  SESSION TYPE = CONWINNER - SENSE = 08420001                     
IST314I  END                                                              
IST1097I  CP-CP SESSION WITH PWNET.PWCDRM03    TERMINATED                 
IST1280I  SESSION TYPE = CONLOSER  - SENSE = 08420001                     
IST314I  END                                                              
IST1488I  INACTIVATION OF RTP CNR00002 AS PASSIVE TO PWNET.PWCDRM03       
IST1416I  ID = CNR00002          FAILED - RECOVERY IN PROGRESS            
IST1136I  VARY INACT CNR00002          SCHEDULED - UNRECOVERABLE ERROR    
IST1133I  CNR00002          IS NOW INACTIVE, TYPE = PU_T2.1               
IST871I  RESOURCE CNR00002 DELETED                                        
IST1133I  ISTPQ1Y1          IS NOW INACTIVE, TYPE = PU_T2              
IST1488I  INACTIVATION OF RTP CNR00001 AS ACTIVE  TO PWNET.PWCDRM03    
IST1416I  ID = CNR00001          FAILED - RECOVERY IN PROGRESS         
IST1136I  VARY INACT CNR00001          SCHEDULED - UNRECOVERABLE ERROR 
IST1133I  CNR00001          IS NOW INACTIVE, TYPE = PU_T2.1            
IST871I  RESOURCE CNR00001 DELETED 

Resolving The Problem

For ISTXCF, the MAXMSG parameter for PATHIN and PATHOUT should be tuned to its upper limit value.  The higher value of MAXMSG parameter does not cause XCF to use more storage.  Therefore, you can raise the value of your MAXMSG parameter to resolve this problem.  For more information see Setting up the sysplex environment for VTAM and TCP/IP functions in the z/OS V2R1 Communication Server SNA Network Implementation Guide.

Also see sections Message Buffers and Calculating message buffer space -- An example in the z/OS V2R1 MVS Setting Up a Sysplex documentation. 
 

Document Location

Worldwide

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Document Information

Modified date:
31 May 2019

UID

ibm10886391

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