PAKS abend with DC201006 and DC027007

Products

• IDMS
• IDMS - Database

Issue/Introduction

The following error messages are issued for either a CICS task or for a batch job running against CV. The messages indicate there was a PAKS abend code.

DC201006 Vnn Tnn CV-Status BE-TaskID Pri FE - ID1 FE - ID2 FE
DC201006 Vnn20 T1 ABRT PAKS nnnnnn 100 nnnnnnnn nnnnnnnn nnnn
DC027007 Vnn Tnn TASK:xxxxxxxx PROG: xxxxxxxx ABENDED WITH CODE PAKS

What does this mean?

Environment

Release: All supported releases.

Cause

The PAKS abend occurs when IDMS tries to allocate storage from the z/OS ECSA (Extended Common Storage Area) for a data packet and the request failed. This is the storage area used by IDMS to allocate the control blocks needed for communicating with batch jobs and CICS tasks.

Resolution

A PAKS abend code can be caused by the following:

• A storage shortage in the ECSA. Use any z/OS monitoring tool to monitor the size of the ECSA and increase the value if necessary. The amount of ECSA in z/OS is specified in the second value of the CSA parameter in SYS1.PAMRLIB member IEASYSxx.
  
  
• Fragmentation of the ECSA. This can happen if z/OS has not been IPLed for a long time.
  
  
• The packet size requested exceeds the z/OS limit of 32K (32768 bytes). The packet size is calculated based on the subschema being used with the following formula:
  PACKET SIZE=(Largest record data length in the subschema) + (Number of record types in the subschema x 24) + 200
  If the packet size is over 32k then the subschemas must be tailored to reduce this upper bound.
  
  
• If using LRF records, CICS run units can receive PAKS abends when accessing very large logical records. This is resolved by implementing RHDCOPTF bit 177.