Red Alert for All TCPIP users on z/OS 1.11, 1.12 using the QDIO Accelerator function

All TCPIP users on z/OS 1.11, 1.12 using the QDIO Accelerator function

Abstract:
A logic error in the QDIO Accelerator function in the base TCPIP code of z/OS 1.11, 1.12 can cause potential data loss.

Description:
TCPIP users with QDIO Accelerator enabled on z/OS 1.11 or z/OS 1.12 can experience a problem that may result in the potential loss of data when the accelerating path suffers a storage shortage condition. The accelerating path does not present any form of notification that a storage shortage condition has occurred.

Please see APAR PM37396 for additional details.

Recommended Actions:
Disable the QDIO Accelerator function until the ++APAR or corrective PTF can be applied. Please see APAR PM37396 for detailed instructions on disabling QDIO Accelerator.

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