PI39406: NEW FUNCTION - IMPROVED GDPS/GM PING RELIABILITY

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Different components within GDPS/GM can issue ping requests for
  communication between the K-sys and the R-sys. There is no
  coordination of these various ping requests and this can result
  in more than one ping request being outstanding at a time,
  waiting for reply. Multiple uncoordinated ping requests between
  K-sys and R-sys can lead to unwarranted
  GEO653E TARGET SYSTEM <IP-address> NOT REACHABLE.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of GDPS/GM                         *
  *                 keywords: GDPSGM/K                           *
  ****************************************************************
  * PROBLEM DESCRIPTION: Different components within GDPS/GM can *
  *                      issue ping requests for communication   *
  *                      between the K-sys and the R-sys. There  *
  *                      is no coordination of these various     *
  *                      ping requests and this can result in    *
  *                      more than one ping request being        *
  *                      outstanding at a time, waiting for      *
  *                      reply. Multiple uncoordinated ping      *
  *                      requests between K-sys and R-sys can    *
  *                      lead to unwarranted                     *
  *                      GEO653E TARGET SYSTEM <IP-address> NOT  *
  *                      REACHABLE.                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

Temporary fix

Comments

• GDPS/GM is changed to serialize ping requests so that a new ping
  request is not issued until a reply or timeout from the last
  ping is received.
  When pings are not being issued because of serialization, the
  following NetLog trace messages can be seen:
  (do_ping): Ping wait 1 second, <operator_name> just made a ping.
  or
  (do_ping): Ping dropped <operator_name> just made a ping.
  instead of
  GEO653E TARGET SYSTEM <IP-address> NOT REACHABLE.
  GDPS/GM is also changed to do fewer pings.
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI33920 UI33921 UI33922 UI33923

Modules/Macros

• VPCDINIT VPCDMON1 VPCDSTAT VPCEXIT7 VPCMFCLT
  VPCMHBMS
  

Fix information

• Fixed component name

  GDPS-GEO DISP P

• Fixed component ID

  694235B00

Applicable component levels

• R3BG PSY UI33920

     UP15/12/18 P F512

• R3BH PSY UI33921

     UP15/12/18 P F512

• R3CG PSY UI33922

     UP15/12/18 P F512

• R3CH PSY UI33923

     UP15/12/18 P F512

Fix is available

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