How To Fix VIRT320 - Min. phys. CP Usage

SAP Error Message - Details

• Message type: E = Error

• Message class: VIRT - Virtualization Monitoring

• Message number: 320

• Message text: Min. phys. CP Usage

Min. phys. CP Usage
Minimum percentage of the total utilization of the physical
processors(CP) by the partition within the last collection interval.
This data is based on the total interval time of all physical processors
and includes LPAR management time.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message VIRT320 - Min. phys. CP Usage ?

  The SAP error message VIRT320, which indicates "Min. phys. CP Usage," typically relates to the minimum physical CPU usage threshold in a virtual environment. This error can occur in SAP systems running on virtual machines, particularly when the system is not utilizing the physical CPU resources efficiently.
  Cause:
  
  Underutilization of Resources: The virtual machine may not be configured to utilize the available physical CPU resources effectively. This can happen if the virtual machine is allocated fewer resources than it requires for optimal performance.
  Configuration Issues: Incorrect settings in the virtualization platform (like VMware, Hyper-V, etc.) can lead to inefficient CPU allocation.
  Workload Imbalance: If the workload on the SAP system is not balanced or if there are bottlenecks in other areas (like memory or I/O), it can lead to low CPU usage.
  SAP Kernel or Configuration Issues: Sometimes, the issue may stem from the SAP kernel version or specific configuration settings that limit CPU usage.
  
  Solution:
  
  Review Resource Allocation: Check the virtual machine's resource allocation settings. Ensure that it has enough virtual CPUs (vCPUs) assigned based on the workload requirements.
  Optimize Virtualization Settings: Adjust the settings in your virtualization platform to ensure that the virtual machine can access the physical CPU resources effectively. This may include settings related to CPU affinity, resource pools, and reservations.
  Monitor Workload: Use SAP transaction codes like ST03N or ST06 to monitor the workload and performance of the system. Identify any bottlenecks or areas where resources are underutilized.
  Adjust SAP Parameters: Review and adjust SAP parameters related to CPU usage, such as rdisp/num_wp (number of work processes) and rdisp/wp_no_btc (number of background work processes), to ensure they align with the available resources.
  Kernel Upgrade: If the issue persists, consider upgrading the SAP kernel to the latest version, as newer versions may have optimizations for better resource management.
  Consult Documentation: Refer to SAP Notes and documentation for specific guidance related to your version of SAP and the virtualization platform you are using.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to performance tuning and virtualization best practices. These notes often provide insights into specific configurations and optimizations.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools to gain insights into CPU usage, memory consumption, and overall system health.
  Virtualization Best Practices: Familiarize yourself with best practices for running SAP on virtualized environments, as these can significantly impact performance and resource utilization.
  
  If the problem persists after trying the above solutions, it may be beneficial to engage with SAP support or your virtualization platform's support for further assistance.