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Possible data corruption when running SUSE Linux Enterprise Server 10 as a guest on z/VM 5.2 or 5.3

This document (3747810) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 10 SP2
SUSE Linux Enterprise Server 10 SP1
SUSE Linux Enterprise Server 10


IBM z/VM 5.2
IBM z/VM 5.3

To avoid data corruption, everyone using or plan to run SUSE Linux Enterprise Server 10 for IBM zSeries and its updates under z/VM versions 5.2 or 5.3 is strongly advised to install the IBM PTF for z/VM APAR VM64306 if all of the following conditions are met:
  • A Linux guest has guest memory above the 2GB boundary attached.
  • The Linux guest uses FCP I/O, or OSA networking in QDIO mode.
  • FCP or OSA adapters are attached to the guest without using theNOQIOASSISTparameter in the device definition statement.

Additional Information

Customers are urgently advised - as a workaround for this issue, until zVM service gets applied - to disable the V=V queue support (QIOASSIST) functions for all FCP and OSA adapters attached to affected guests.

This can be done by specifying the NOQIOASSIST parameter in the device definition statement or when attaching the adapter to the guest. It is not sufficient to set QIOASSIST=OFF for the guest or host
system by issuing the SET QIOASSIST OFF command.

Note that enabling this workaround will increase CPU consumption in the host system.


This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:3747810
  • Creation Date: 07-Dec-2007
  • Modified Date:04-Mar-2021
    • SUSE Linux Enterprise Server

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