IT22457: XIV PORT STATISTICS ARE REPORTED INCORRECTLY.

IBM Spectrum Control 5.2.15.1 - Agents
IBM Spectrum Control 5.2.15.1 - AIX Server
IBM Spectrum Control 5.2.15.1 - Linux Server
IBM Spectrum Control 5.2.15.1 - Windows Server
IBM Spectrum Control V5.2.15.2 (November 2017)
IBM Spectrum Control V5.2.16 (March 2018)
IBM Spectrum Control V5.2.17 (May 2018)

APAR status

• Closed as program error.

Error description

• The masking information for some port's host connections are
  missing. This causes the performance collector to aggregate
  those host connections' statistics incorrectly.
  
  There are no errors to report.  In an observed case, two XIV FC
  ports that are known to have an equally balanced workload,
  report differently in Spectrum Control with one port showing a
  lot more throughput than the other.
  
  The IBM Spectrum Control code summarizes raw statistics before
  deltas have been computed, this cannot work reliably.  This
  happens only when a host port is unknown to Spectrum Control
  
  RECREATE STEPS:
  Observe incorrectly reported port statistics in 5.2.12+
  ________________________________________________________________
  DB2 Version used for Server:  		n/a
  The defect is against component:  	5608TPC00
  Server/Manager build/release (TPC):  	5.2.12
  
  ________________________________________________________________
  Problem as described by customer:  	total port data rate for XIV
  believed to be inaccurate
  Initial customer impact (low/med/high): low
  

Local fix

• apply fixing version when available
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * IBM Spectrum Control 5.2.x users monitoring XIV storage      *
  * device                                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * When IBM Spectrum Control probed the XIV device, some of the *
  * masking information for some port's host connections are     *
  * missing. This causes the performance collector to aggregate  *
  * those host connections' statistics incorrectly.              *
  *                                                              *
  * There were no errors to report.  In an observed case, two    *
  * XIV FC ports that are known to have an equally balanced      *
  * workload, report differently in Spectrum Control with one    *
  * port showing a lot more throughput than the other.           *
  *                                                              *
  * The IBM Spectrum Control code summarizes raw statistics      *
  * before deltas have been computed, this cannot work reliably. *
  * This happens only when a host port is unknown to Spectrum    *
  * Control.                                                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• The fix for this APAR is targeted for both of the following:
  
  
  IBM Spectrum Control 5.2.15.1  |  fix pack  |
  5.2.15-TIV-TPC-FP0001  [ target December 2017 ]
  
  http://www.ibm.com/support/docview.wss?&uid=swg21320822
  
  The target dates for future fix packs do not represent a formal
  commitment by IBM. The dates are subject to change without
  notice.
  
  
  
  IBM Spectrum Control 5.3.0  [ target March 2018 ]
  
  http://www.ibm.com/support/docview.wss?&uid=swg21320822
  
  The target dates for future releases do not represent a formal
  commitment by IBM. The dates are subject to change without
  notice.
  

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

  TPC

• Fixed component ID

  5608TPC00

Applicable component levels