How To Fix VIRT235 - Useable 16GB Pages

SAP Error Message - Details

• Message type: E = Error

• Message class: VIRT - Virtualization Monitoring

• Message number: 235

• Message text: Useable 16GB Pages

What causes this issue?

The number of immediately available 16GB pages for applications.

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 VIRT235 - Useable 16GB Pages ?

  The SAP error message VIRT235, which indicates "Useable 16GB Pages," typically relates to memory management issues in the SAP system, particularly in environments that utilize large pages for memory allocation. This error can occur in systems that are configured to use large memory pages (16GB pages) but are unable to allocate them due to insufficient resources or misconfiguration.
  Cause:
  
  Insufficient Memory: The system may not have enough physical memory available to allocate the required large pages.
  Configuration Issues: The SAP system or the underlying operating system may not be configured correctly to support large pages.
  Operating System Limitations: Some operating systems have limitations on the number of large pages that can be allocated or may require specific settings to enable large page support.
  Kernel Parameters: The kernel parameters related to memory management may not be set correctly, leading to issues with large page allocation.
  
  Solution:
  
  Check Memory Availability: Ensure that the server has enough physical memory installed to support the allocation of large pages. You may need to add more RAM if the current configuration is insufficient.
  Configure Large Pages:
  
  For Linux: Ensure that the hugepages are configured correctly. You can check the current configuration using:
  cat /proc/meminfo | grep Huge
  You may need to adjust the number of huge pages in /etc/sysctl.conf or use the echo command to set it dynamically.
  
  For Windows: Ensure that the system is configured to allow large page support. This may involve adjusting system settings or group policies.
  
  
  Adjust Kernel Parameters: Modify kernel parameters related to memory management. For example, on Linux, you might need to adjust vm.nr_hugepages to increase the number of available huge pages.
  SAP Profile Parameters: Check the SAP instance profile parameters related to memory management. Ensure that parameters like abap/heap_area_dia, abap/heap_area_nondia, and abap/heap_area_total are set appropriately.
  Restart the SAP System: After making changes to the configuration, restart the SAP system to apply the new settings.
  
  Related Information:
  
  Documentation: Refer to the SAP Notes and documentation related to memory management and large page support for your specific SAP version and operating system.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  Monitoring Tools: Use monitoring tools to keep track of memory usage and allocation patterns to prevent future occurrences of this error.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance.