How To Fix VIRT330 - WLM Vary CPU Management

SAP Error Message - Details

• Message type: E = Error

• Message class: VIRT - Virtualization Monitoring

• Message number: 330

• Message text: WLM Vary CPU Management

WLM Vary CPU Management
If WLM Vary CPU Management is enabled, the number of online logical CPUs
are also changed when LPAR weights (see LPAR Weights CP / IIP) change.
It?s changed to maintain the best match between logical CPU speed and
physical CPU speed.

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message VIRT330 - WLM Vary CPU Management ?

  The SAP error message VIRT330 WLM Vary CPU Management typically relates to issues with workload management (WLM) in SAP systems, particularly in environments that utilize IBM's z/OS or similar mainframe systems. This error can occur when there are problems with the configuration or management of CPU resources allocated to different workloads.
  Cause:
  
  Resource Allocation Issues: The error may arise when the system is unable to allocate the required CPU resources to a specific workload due to configuration settings or resource limits.
  WLM Configuration: Incorrect or suboptimal WLM configuration can lead to inefficient CPU management, causing the system to generate this error.
  High Workload Demand: If the system is experiencing a high demand for CPU resources, it may trigger this error as the WLM struggles to manage the workload effectively.
  System Performance Issues: General performance issues within the system can also lead to this error, especially if the system is under heavy load or if there are bottlenecks.
  
  Solution:
  
  Review WLM Configuration: Check the WLM configuration settings to ensure they are optimized for your workload. This includes reviewing service classes, workload management policies, and the distribution of resources.
  Adjust Resource Allocation: If certain workloads are consistently underperforming, consider adjusting the CPU resource allocation to provide more resources to those workloads.
  Monitor Workload Performance: Use monitoring tools to analyze workload performance and identify any bottlenecks or resource contention issues. This can help in making informed adjustments to the WLM settings.
  Increase CPU Capacity: If the system is consistently running at high CPU utilization, consider increasing the CPU capacity or scaling out the environment to handle the workload more effectively.
  Consult Documentation: Refer to SAP and IBM documentation for specific guidelines on configuring WLM and managing CPU resources effectively.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  IBM Documentation: Review IBM's documentation on WLM and CPU management for best practices and configuration guidelines.
  Performance Monitoring Tools: Utilize performance monitoring tools available for your SAP environment to gain insights into CPU usage and workload performance.
  Support: If the issue persists, consider reaching out to SAP support or your system administrator for further assistance.
  
  By addressing the underlying causes and optimizing the WLM configuration, you can resolve the VIRT330 error and improve the overall performance of your SAP system.