IV22011: ENABLING POLLER PROFILING MAY CAUSE FALSE PING FAILURES

IBM Tivoli Network Manager IP 3.9.0 Fix Pack 3, 3.9.0-TIV-ITNMIP-FP0003
IBM Tivoli Network Manager IP 3.9.0 Fix Pack 4, 3.9.0-TIV-ITNMIP-FP0004
IBM Tivoli Network Manager IP Edition 3.9.0 Fix Pack 5, 3.9.0-TIV-ITNMIP-FP0005

APAR status

• Closed as program error.

Error description

• We have identified multiple issues in the field related to the
  ITNM code that gathers certain poller profiling metrics. There
  is a CPU cost to these metrics for the Poller which may not
  affect you unless you are using a large number of SNMP polls.
  This can result in CPU usage spikes and delay polling for a few
  seconds, causing a flood of polls upon release. This is not
  usually noticed unless it is sufficient to impact the regular
  pattern of polls to the network.
  

Local fix

• To disable these metrics being polled:
  
  Edit the file $NCHOME/etc/precision/NcPollerSchema.cfg and add
  this line to the end:
  
          update config.properties set PollerProfiling = 0;
  
  Then, restart the poller.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All ITNM 3.9 users                                           *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * We have identified multiple issues in the field related to   *
  * the                                                          *
  * ITNM code that gathers certain poller profiling metrics.     *
  * There                                                        *
  * is a CPU cost to these metrics for the Poller which may not  *
  * affect you unless you are using a large number of SNMP       *
  * polls.                                                       *
  * This can result in CPU usage spikes and delay polling for a  *
  * few                                                          *
  * seconds, causing a flood of polls upon release. This is not  *
  * usually noticed unless it is sufficient to impact the        *
  * regular                                                      *
  * pattern of polls to the network.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * | fix pack | 3.9.0-ITNMIP-FP0002                             *
  ****************************************************************
  

Problem conclusion

• If you use, or are considering using, ITM to monitor the health
  of ITNM, be aware that some Poller profiling metrics have been
  disabled by default in FP2 & Refresh.  This affects the ITM
  Health charts in TEP for ITNM on the IP Monitoring Workspace.
  The charts affected are SNMP Errors and Timeouts, MIB Objects
  Retrieved, and Packets Sent and Processed by Poller.
  
  To re-enable these metrics, follow these steps
           Edit the file $NCHOME/etc/precision/NcPollerSchema.cfg
  and add this line to the end:
                 update config.properties set PollerProfiling = 1;
           Restart the poller.
  
  There is a CPU cost to these metrics for the Poller which may
  not affect you unless you are using a large number of SNMP
  polls.  This can result in CPU usage spikes and delay polling
  for a few seconds, causing a flood of polls upon release.  This
  is not usually noticed unless it is sufficient to impact the
  regular pattern of polls to the network.
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  TIV NETWK MGR I

• Fixed component ID

  5724S4500

Applicable component levels

• R390 PSN

     UP

• R390 PSY

     UP