How To Fix HH024 - At least 1 mirror chunk is offline

SAP Error Message - Details

• Message type: E = Error

• Message class: HH - (Long) text for check tool 'infcfgcheck'

• Message number: 024

• Message text: At least 1 mirror chunk is offline

What causes this issue?

The specified dbspace is mirrored, but at least one mirror
chunk is offline.

System Response

How to fix this error?

Check all the mirror chunks of the specified dbspace using the
SAP and/or Informix administration tools.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message HH024 - At least 1 mirror chunk is offline ?

  The SAP error message HH024, which states "At least 1 mirror chunk is offline," typically relates to issues with the database storage configuration, particularly in environments using high availability or mirroring setups. This error indicates that one or more of the mirrored data chunks (or segments) in the database are not accessible or are offline, which can lead to potential data loss or unavailability of the database.
  Causes:
  
  Hardware Failure: A physical disk failure or issues with the storage subsystem can cause one or more mirror chunks to go offline.
  Network Issues: If the mirrored database is on a different server, network connectivity issues can prevent access to the mirror.
  Configuration Errors: Incorrect configuration settings in the database or storage system can lead to chunks being marked as offline.
  Database Corruption: Corruption in the database can cause certain chunks to become unavailable.
  Maintenance Activities: Scheduled maintenance or updates might inadvertently take a chunk offline.
  
  Solutions:
  
  Check Hardware Status: Verify the status of the physical disks and storage systems. Replace any failed hardware components.
  Network Diagnostics: Ensure that there are no network issues affecting connectivity between the primary and mirrored databases.
  Review Configuration: Check the database and storage configuration settings to ensure they are correct and that all chunks are properly configured.
  Database Recovery: If corruption is suspected, consider running database recovery tools or restoring from a backup if necessary.
  Restart Services: Sometimes, simply restarting the database services or the server can bring the offline chunks back online.
  Consult Logs: Review the database logs for any error messages or warnings that could provide more context on why the chunks are offline.
  Contact Support: If the issue persists, consider reaching out to SAP support or your database administrator for further assistance.
  
  Related Information:
  
  Database Documentation: Refer to the specific database documentation (e.g., SAP HANA, Oracle, etc.) for detailed troubleshooting steps related to mirroring and chunk management.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Monitoring Tools: Utilize monitoring tools to keep track of the health of your database and storage systems to prevent future occurrences.
  
  By addressing the underlying causes and following the appropriate solutions, you can resolve the HH024 error and restore normal operation to your SAP environment.