How To Fix VIRT233 - Useable 4KB Pages

SAP Error Message - Details

• Message type: E = Error

• Message class: VIRT - Virtualization Monitoring

• Message number: 233

• Message text: Useable 4KB Pages

What causes this issue?

The number of immediately available 4KB 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 VIRT233 - Useable 4KB Pages ?

  The SAP error message VIRT233, which indicates "Useable 4KB Pages," typically relates to issues with memory management in the SAP system, particularly in environments that utilize large pages or memory configurations that are not optimal for the workload.
  Cause:
  
  Memory Configuration: The error often arises when the SAP system is configured to use large pages (2MB or larger) but the underlying operating system or hardware does not support it properly, or the configuration is not optimal.
  Insufficient Memory: The system may not have enough available memory to allocate the required 4KB pages, leading to this error.
  Kernel Parameters: Incorrect kernel parameters or settings related to memory management can also trigger this error.
  Virtual Memory Settings: The virtual memory settings on the operating system may not be configured to allow for the necessary page sizes.
  
  Solution:
  
  Check Memory Configuration: Ensure that the SAP system is configured correctly to use the appropriate page sizes. If large pages are not needed, consider switching back to standard 4KB pages.
  Adjust Kernel Parameters: Review and adjust the kernel parameters related to memory management. This may include settings for shared memory, semaphores, and other related parameters.
  Increase Available Memory: If the system is running low on memory, consider increasing the physical memory available to the server or optimizing the workload to reduce memory consumption.
  Operating System Settings: Verify the operating system settings to ensure that they support the required memory configurations. This may involve checking settings related to virtual memory and page sizes.
  SAP Notes: Check for any relevant SAP Notes or updates that may address this specific error. SAP frequently releases patches and updates that can resolve known issues.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for guidance on memory management and configuration best practices.
  Operating System Documentation: Consult the documentation for your specific operating system (e.g., Linux, Windows) for details on memory management and configuration.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found effective.
  Performance Monitoring: Use SAP performance monitoring tools to analyze memory usage and identify potential bottlenecks or misconfigurations.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage SAP support for further assistance.