How To Fix VIRT239 - In Use 16GB Pages

SAP Error Message - Details

• Message type: E = Error

• Message class: VIRT - Virtualization Monitoring

• Message number: 239

• Message text: In Use 16GB Pages

What causes this issue?

The number of 16GB pages in real memory which are in use.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message VIRT239 - In Use 16GB Pages ?

  The SAP error message VIRT239 "In Use 16GB Pages" typically indicates that the system is encountering issues related to memory management, specifically with the use of large pages (16GB pages) in a virtualized environment. This error can occur in systems that are configured to use large pages for performance optimization, but there may be constraints or misconfigurations that lead to this error.
  Cause:
  
  Memory Allocation Issues: The system may be trying to allocate memory using 16GB pages, but there may not be enough contiguous memory available.
  Configuration Problems: The SAP system or the underlying operating system may not be properly configured to support large pages.
  Resource Limits: The virtual machine or physical server may have resource limits that prevent the allocation of large pages.
  Operating System Constraints: The operating system may have limitations or settings that restrict the use of large pages.
  
  Solution:
  
  Check Memory Configuration: Ensure that the system has enough physical memory available to support the allocation of 16GB pages. You may need to increase the memory allocation for the virtual machine or physical server.
  Review SAP and OS Settings: Verify that the SAP system and the operating system are configured correctly to use large pages. This may involve checking kernel parameters or SAP profile parameters.
  Adjust Resource Limits: If you are running in a virtualized environment, check the resource limits set on the virtual machine. Ensure that there are no restrictions on memory allocation.
  Use Smaller Page Sizes: If the issue persists, consider configuring the system to use smaller page sizes (e.g., 2MB pages) instead of 16GB pages, if performance allows.
  Consult Documentation: Refer to SAP Notes and documentation related to memory management and large page support for your specific SAP version and operating system.
  Monitor System Performance: Use monitoring tools to track memory usage and performance metrics to identify any bottlenecks or issues that may be contributing to the error.
  
  Related Information:
  
  SAP Notes: Check for relevant SAP Notes that address this specific error message or provide guidance on memory management and large page configuration.
  Operating System Documentation: Review the documentation for your operating system regarding large page support and configuration.
  Performance Tuning: Consider engaging with SAP support or a consultant for performance tuning if the issue is impacting system performance significantly.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.