How To Fix HH026 - 'SINGLE_CPU_VP' incorrectly configured with regard to 'NUMCPUVPS'

SAP Error Message - Details

• Message type: E = Error

• Message class: HH - (Long) text for check tool 'infcfgcheck'

• Message number: 026

• Message text: 'SINGLE_CPU_VP' incorrectly configured with regard to 'NUMCPUVPS'

What causes this issue?

ONCONFIG parameter SINGLE_CPU_VP was not configured correctly:
SINGLE_CPU_VP should be '1' if the ONCONFIG parameter
NUMCPUVPS is also '1'. Otherwise SINGLE_CPU_VP should be '0'.
An incorrect configuration of SINGLE_CPU_VP can result in a loss of
performance.
CAUTION: Due to an Informix bug, this single check could under certain
circumstances (!) display an incorrect configuration of the
'<CONFIG. table>' value although the configuration is correct in the
ONCONFIG file (and the database was started up) (see Note 61150).
To be on the safe side, proceed as described below.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

To set SINGLE_CPU_VP to the recommended value, edit (as user
'informix') the file '$INFORMIXDIR/etc/$ONCONFIG'.
CAUTION: The change only becomes active when the database is started
up.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message HH026 - 'SINGLE_CPU_VP' incorrectly configured with regard to 'NUMCPUVPS' ?

  The SAP error message HH026 indicates that there is a configuration issue related to the number of CPU virtual processors (NUMCPUVPS) in the SAP system. This error typically arises in environments where SAP is running on virtual machines, particularly in scenarios involving SAP NetWeaver or SAP HANA.
  Cause:
  The error HH026 'SINGLE_CPU_VP' incorrectly configured with regard to 'NUMCPUVPS' usually occurs due to one of the following reasons:
  
  
  Incorrect Configuration: The system is configured to use a single CPU virtual processor (SINGLE_CPU_VP), but the NUMCPUVPS parameter is set to a value greater than 1. This mismatch leads to the error.
  
  
  Virtual Machine Settings: The underlying virtual machine may not be configured correctly to support the number of virtual CPUs that the SAP system is trying to use.
  
  
  SAP Kernel Version: The version of the SAP kernel may not support the current configuration, especially if there have been recent changes to the system.
  
  
  Solution:
  To resolve the HH026 error, you can follow these steps:
  
  
  Check Configuration:
  
  Verify the value of the NUMCPUVPS parameter in the instance profile. This can be done using transaction RZ10 or by directly editing the instance profile file.
  Ensure that the value of NUMCPUVPS is set to 1 if you are using SINGLE_CPU_VP.
  
  
  
  Adjust Virtual Machine Settings:
  
  If you need to use multiple virtual CPUs, ensure that the virtual machine is configured to support multiple CPU cores. Adjust the settings in your virtualization platform (e.g., VMware, Hyper-V) to allocate the desired number of virtual CPUs.
  
  
  
  Restart the SAP Instance:
  
  After making changes to the configuration, restart the SAP instance for the changes to take effect.
  
  
  
  Check SAP Notes:
  
  Look for relevant SAP Notes that may address this specific error or provide additional guidance. SAP Notes can provide patches or configuration recommendations.
  
  
  
  Update SAP Kernel:
  
  If the issue persists, consider updating the SAP kernel to the latest version, as newer versions may have fixes for known issues.
  
  
  
  Related Information:
  
  Documentation: Refer to the SAP Help Portal for documentation on configuring SAP instances and virtual machines.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  Performance Considerations: Be aware that configuring the number of virtual CPUs can impact the performance of your SAP system. It is essential to balance the configuration based on the workload and the underlying hardware capabilities.
  
  By following these steps, you should be able to resolve the HH026 error and ensure that your SAP system is configured correctly with respect to CPU virtual processors.