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DFHFC0964 VSAM Codes 8502 0008 00DC open file DFHCSD failed

Troubleshooting


Problem

You receive message DFHFC0964 OPEN of file DFHCSD failed VSAM codes - 8502,0008,00DC. This occurs when attempting to start your CICS Transaction Sever for z/OS (CICS TS) region after upgrading to a new release of CICS. You used the utility program to upgrade the CSD.

Symptom

DFHFC0964 OPEN of file DFHCSD failed. VSAM codes - 8502,0008,00DC
DFHAM4864 Unable to perform operation - DFHCSD cannot be opened

Cause

A VSAM return code of 00DC (220 X'DC") indicates that the data set's control interval (CI) size exceeds the size of the largest buffer. In this case, an IDCAMS LISTCAT showed the CSD had defaulted to an 18K CISIZE. However, a buffer large enough to hold an 18K CI had not been defined to CICS.

Resolving The Problem

Define a buffer pool to CICS large enough to hold the CI size of the CSD. The CICS information center under LSRPOOL resources in the CICS information center states:

You can associate the CSD file with a particular LSRPOOL by specifying the CSDLSRNO system initialization parameter. The default is pool 1; ensure that sufficient buffers of an appropriate size are provided to permit the CSD file to be used by CICS.

In this case, the LSRPOOL attribute DATA20K() was used to define a 20K data buffer pool.

[{"Product":{"code":"SSGMGV","label":"CICS Transaction Server"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"File Control","Platform":[{"code":"PF035","label":"z\/OS"}],"Version":"5.1;4.2;4.1;3.2;3.1","Edition":"","Line of Business":{"code":"LOB70","label":"Z TPS"}}]

Product Synonym

CICS/TS CICS TS CICS Transaction Server

Document Information

Modified date:
05 January 2026

UID

swg21025544

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