How To Fix VIRT236 - In Use 4KB Pages

SAP Error Message - Details

• Message type: E = Error

• Message class: VIRT - Virtualization Monitoring

• Message number: 236

• Message text: In Use 4KB Pages

What causes this issue?

The number of 4KB 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 VIRT236 - In Use 4KB Pages ?

  The SAP error message VIRT236 "In Use 4KB Pages" typically indicates that the SAP system is attempting to allocate memory using 4KB pages, but there is an issue with the memory configuration or allocation. This error can occur in environments where the SAP system is running on a virtual machine or when there are specific memory management settings in place.
  Cause:
  
  Memory Configuration: The system may be configured to use a different page size (e.g., large pages) but is trying to allocate memory in 4KB pages, which can lead to conflicts.
  Insufficient Memory: The system may not have enough available memory to allocate the required 4KB pages.
  Virtualization Settings: If the SAP system is running on a virtual machine, the hypervisor settings may not be optimized for the memory allocation required by SAP.
  Operating System Settings: The operating system may have restrictions or configurations that prevent the proper allocation of memory pages.
  
  Solution:
  
  Check Memory Configuration: Review the memory settings in the SAP system and ensure that they are configured correctly for the intended page size. If large pages are intended, ensure that the system is set up to use them.
  Increase Memory Allocation: If the system is running low on memory, consider increasing the memory allocation for the SAP instance. This can be done by adjusting the settings in the virtualization platform or the operating system.
  Review Virtualization Settings: If running on a virtual machine, check the hypervisor settings to ensure that memory allocation is optimized for SAP workloads. This may include enabling features like memory ballooning or adjusting the memory reservation settings.
  Operating System Tuning: Review the operating system's memory management settings. Ensure that there are no restrictions on memory allocation that could be causing the issue.
  SAP Notes and Support: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates that can resolve the issue.
  
  Related Information:
  
  SAP Kernel Version: Ensure that you are using a supported and up-to-date version of the SAP kernel, as memory management features can vary between versions.
  Operating System Compatibility: Verify that the operating system is compatible with the SAP version you are running, as certain configurations may differ between OS versions.
  Monitoring Tools: Utilize monitoring tools to track memory usage and allocation patterns in the SAP system. This can help identify potential bottlenecks or misconfigurations.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with SAP support or your system administrator for further assistance.