How To Fix RSDD_ZA159 - Check of Hosts That Do Not Use Shared Memory

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD_ZA - Messages from TREX Aggregate Area

• Message number: 159

• Message text: Check of Hosts That Do Not Use Shared Memory

What causes this issue?

Under certain circumstances, it is possible that the BWA is configured
in such a way that it does not used shared memory. This results in a
loss of performance.

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 RSDD_ZA159 - Check of Hosts That Do Not Use Shared Memory ?

  The SAP error message RSDD_ZA159, which indicates a check of hosts that do not use shared memory, typically arises in the context of SAP BW (Business Warehouse) or SAP HANA environments. This error is related to the configuration of the system's memory management, particularly when it comes to how different hosts in a distributed environment communicate and share data.
  Cause:
  
  
  Configuration Issues: The error often occurs when the SAP system is not configured to use shared memory for communication between different application servers or hosts. This can happen if the necessary parameters for shared memory are not set correctly in the system profile.
  
  
  Network Configuration: If the network settings do not allow for shared memory communication, or if there are firewall rules blocking the necessary ports, this error can also occur.
  
  
  Resource Limitations: If the system is running low on resources (like memory), it may not be able to allocate shared memory segments properly.
  
  
  Solution:
  
  
  Check Configuration: 
  
  Ensure that the SAP system is configured to use shared memory. This can typically be done by checking the instance profile parameters related to shared memory, such as rdisp/memsize, rdisp/SharedMemory, and rdisp/SharedMemorySize.
  You may need to adjust these parameters based on your system's requirements and available resources.
  
  
  
  Review Network Settings: 
  
  Verify that the network configuration allows for shared memory communication. Check for any firewall settings that might be blocking the necessary ports.
  Ensure that the hosts can communicate with each other without restrictions.
  
  
  
  Monitor System Resources: 
  
  Check the system's memory usage and ensure that there is enough available memory for shared memory allocation. If necessary, consider increasing the physical memory or optimizing the current memory usage.
  
  
  
  Restart the System: 
  
  After making changes to the configuration, it may be necessary to restart the SAP system or the affected application servers to apply the changes.
  
  
  
  Consult SAP Notes: 
  
  Look for relevant SAP Notes or documentation that may provide additional insights or specific instructions related to your version of SAP BW or HANA.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for your specific version of SAP BW or HANA for detailed configuration guidelines.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide insights or solutions.
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  By following these steps, you should be able to diagnose and resolve the RSDD_ZA159 error effectively.