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Red Alert - Potential exposure for undetected loss of data for z/OS users writing data to zEDC compressed data sets using QSAM on releases z/OS 1.13, 2.1 & 2.2

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The z System Software community releases support bulletins to let you know about critical problems in a product that runs on a zSeries server.
 

Date: 2016.03.14

Abstract:

Potential exposure for undetected loss of data for z/OS users writing data to zEDC compressed data sets using QSAM on releases z/OS 1.13, 2.1 & 2.2.

Description:

Data loss may occur when writing to a zEDC compressed data set using QSAM when CLOSE is issued and there exists a partial QSAM buffer that has not yet been written, and all allocated space in the data set is filled. In this case, the unwritten partial buffer may not be written after CLOSE processing obtains the new extent for the data set.

The problem does not apply to BSAM or other access methods.

Please see APAR OA50061 for additional information.

Recommended Actions:

++APAR for OA50061 should be applied for all environments with zEDC compressed data sets. This requires an IPL to activate.

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Document Information

Modified date:
21 September 2022

UID

ibm11591341

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