OA56394: LARGE VOLUME OF KT1 REQUESTS DURING AN ITM-BASED TADDM DISCOVERY CAUSES HIGH CPU AT THE HUB TEMS

APAR status

• Closed as program error.

Error description

• Problem:
  When performing an ITM based TADDM discovery using the KT1
  component, a large volume (10K+) of
  getfile/executeCommand/putFile requests are made against the
  node list table on the hub TEMS, resulting in high CPU and a
  performance degradation
  
  Root Cause :
  Validation of each request involves an entire scan of the Node
  List table; the overhead of doing so becomes significant when
  the rate of requests is high and the Node List table is even of
  a moderate size.
  
  Solution :
  Optimise the KT1 code to avoid scanning the entire Node List
  table during request validation.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All TEMS users.                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * LARGE VOLUME OF KT1 REQUESTS DURING AN                       *
  * ITM-BASED TADDM DISCOVERY CAUSES HIGH                        *
  * CPU AT THE HUB TEMS.                                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply this PTF.                                              *
  ****************************************************************
  When performing an ITM based TADDM discovery using the KT1
  component, a large volume (10K+) of getfile/executeCommand/
  putFile requests are made against the node list table on the
  hub TEMS, resulting in high CPU and a performance degradation.
  

Problem conclusion

• Optimised the KT1 code to avoid scanning the entire Node List
  table during request validation.
  

Temporary fix

Comments

APAR Information

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

  IJ01062

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

Fix information

• Fixed component name

  MGMT SERVER DS

• Fixed component ID

  5608A2800

Applicable component levels