How To Fix SDS_COMMON021 - Number of aRFC processes &1 is larger than the maximum value &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SDS_COMMON -

• Message number: 021

• Message text: Number of aRFC processes &1 is larger than the maximum value &2

What causes this issue?

The number of asynchronous processes &V1& that you want to allow for the
download exceeds the maximum value of &V2&.
The maximum number of asynchronous processes is calculated with respect
to the application server configuration. So the maximum number depends
on the fact that asynchronous processes are allowed at all, the
available memory, and the number of available dialog work processes.

System Response

A download cannot be executed with this setting.

How to fix this error?

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

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 SDS_COMMON021 - Number of aRFC processes &1 is larger than the maximum value &2 ?

  The SAP error message SDS_COMMON021 indicates that the number of asynchronous Remote Function Call (aRFC) processes configured in your system exceeds the maximum allowed value. This can occur in scenarios where the system is configured to handle a certain number of aRFC processes, but the current configuration or workload has exceeded that limit.
  Cause:
  
  Configuration Issue: The number of aRFC processes has been set too high in the system configuration.
  System Load: The system is under heavy load, causing the number of aRFC processes to spike beyond the configured maximum.
  Parameter Settings: The parameters related to aRFC processes in the SAP system profile may not be set correctly.
  
  Solution:
  
  
  Check Configuration:
  
  Go to transaction RZ10 to check the profile parameters related to aRFC processes.
  Look for parameters like rfc/max_aRFC_procs and rfc/max_aRFC_procs_per_user. Ensure that these values are set appropriately based on your system's capacity and workload.
  
  
  
  Adjust Parameters:
  
  If the current settings are too low for your workload, consider increasing the values of the relevant parameters.
  After making changes, you will need to restart the SAP instance for the changes to take effect.
  
  
  
  Monitor System Load:
  
  Use transaction SM66 or SM50 to monitor the current processes and identify if there are any long-running or stuck aRFC calls that may be consuming resources.
  If necessary, terminate any problematic processes.
  
  
  
  Review Workload:
  
  Analyze the workload on the system to determine if there are specific transactions or processes that are causing excessive aRFC calls.
  Optimize or schedule these processes to reduce the load on the system.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for details on configuring aRFC processes and understanding the implications of the parameters.
  Performance Tuning: Consider performance tuning of your SAP system to ensure it can handle the expected workload without hitting limits.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the SDS_COMMON021 error and ensure that your SAP system can handle the required number of aRFC processes effectively.