OA64904: IOS080I May be issued for long running I/Os like CFW COMMIT that exceed I/O timing values. Add support for Non-Disruptive States

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• TDMF will issue a Perform Subsystem Function CCW to commit
  Cache Fast Write data to the disk if a CFW ID is found in the
  controller.
  
  NOTE: This will be done even if CFW has been deactivated by
  an IDCAMS SETCACHE command.
  
  PSF and other maintenance CCWs may take longer than the IOT or
  MIH values depending on the customer IOT/MIH settings.
  
  Some customers will disable CFW at the CU level due to HyperSwap
  recommendations, TDMF will check this and not issue the COMMIT.
  
  TDMF will now allow a Non-Disruptive Statesave to be issued to
  a migration volume, previously all Diagnostic Control CCWs would
  terminate the migration volume.
  

Local fix

• IOT and MIH values can be set by device class or individually
  via the SETIOS command.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users who lower the IOT (I/O Timing) values  *
  *                 below the suggested 6 second value.          *
  ****************************************************************
  * PROBLEM DESCRIPTION: IOS080I can be issued for long running  *
  *                      I/Os when the IOT value is lower than   *
  *                      the time taken to complete the I/O.     *
  *                                                              *
  *                      In this case a CFW COMMIT can take 5    *
  *                      seconds to complete.                    *
  *                                                              *
  *                      In this instance automation is used to  *
  *                      trigger a Non-Disruptive Statesave and  *
  *                      TDMF terminated the volume migration    *
  *                      due to the Diagnostic Control CCW       *
  ****************************************************************
  * RECOMMENDATION: Apply the fix                                *
  ****************************************************************
  TDMF will not issue the CFW COMMIT if the CU has CFW disabled.
  
  We will now support the NDSS and not terminate the volume
  migration.
  

Problem conclusion

• Code changed to check for CFW being disabled and to allow the
  NDSS Diagnostic Control CCW.
  

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:

  UJ93230 UJ93231 UJ93232 UJ93233

Modules/Macros

• GTDICPY  GTDIMON
  

Fix information

• Fixed component name

  TDMF Z/OS

• Fixed component ID

  TDMFZOS01

Applicable component levels

• R580 PSY UJ93231

     UP23/07/19 P F307

• R590 PSY UJ93230

     UP23/07/19 P F307

• R5A0 PSY UJ93233

     UP23/07/19 P F307

• R5B0 PSY UJ93232

     UP23/07/19 P F307

Fix is available

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