How To Fix RSDD_ZA449 - Set the nfs mount options to the recommended value

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD_ZA - Messages from TREX Aggregate Area

• Message number: 449

• Message text: Set the nfs mount options to the recommended value

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDD_ZA449 - Set the nfs mount options to the recommended value ?

  The SAP error message RSDD_ZA449, which suggests setting the NFS (Network File System) mount options to the recommended value, typically arises in the context of SAP BW (Business Warehouse) or SAP HANA environments where NFS is used for data storage or file sharing.
  Cause:
  This error usually indicates that the NFS mount options currently in use do not meet the performance or stability requirements set by SAP. The specific NFS options can affect how data is accessed and can lead to issues such as performance degradation, data inconsistency, or even system crashes.
  Recommended NFS Mount Options:
  To resolve this error, you should ensure that your NFS mounts are configured with the recommended options. While the exact options may vary based on your specific SAP version and environment, common recommended options include:
  
  rw: Mount the filesystem as read-write.
  hard: Ensure that the NFS client will retry requests indefinitely if the server becomes unresponsive.
  intr: Allow NFS requests to be interrupted if the server goes down.
  no_root_squash: Allow root on the client to have root access on the NFS server.
  async: Allow the NFS server to respond to requests before the data is written to disk, which can improve performance.
  rsize=8192 and wsize=8192: Set the read and write buffer sizes to 8192 bytes (or higher, depending on your network and server capabilities).
  
  Solution Steps:
  
  
  Identify the NFS Mounts: Check your current NFS mounts using the mount command or by inspecting the /etc/fstab file.
  
  
  Modify the Mount Options: If the current options do not match the recommended settings, you will need to modify them. This can typically be done by editing the /etc/fstab file or by remounting the NFS with the correct options.
  Example entry in /etc/fstab:
  nfs_server:/exported/path /mount/point nfs rw,hard,intr,no_root_squash,async,rsize=8192,wsize=8192 0 0
  
  
  Remount the NFS: After making changes to the /etc/fstab, you can remount the NFS with the following command:
  sudo mount -o remount /mount/point
  
  
  Verify the Changes: Use the mount command again to verify that the NFS is mounted with the correct options.
  
  
  Restart SAP Services: Depending on your environment, you may need to restart SAP services or the entire system to ensure that the changes take effect.
  
  
  Related Information:
  
  SAP Notes: Always check the SAP Support Portal for any specific notes related to your version of SAP BW or HANA, as they may provide additional guidance or updated recommendations.
  NFS Documentation: Review the NFS documentation for your operating system to understand the implications of different mount options.
  Performance Monitoring: After making changes, monitor the performance of your SAP system to ensure that the changes have resolved the issue and improved stability.
  
  By following these steps and ensuring that your NFS mount options are set correctly, you should be able to resolve the RSDD_ZA449 error.