How to reset the Repository ID in AEM

Statement : Assuming you have cluster setup and you are cloning one of the server and starting as a standalone but the repository ID is still pointing to the cluster instance.So how to change the Repository ID to avoid once again clustering of the standalone instance.

Solution :

• Go to JMX console : http://localhost:4502/system/console/jmx
• Search for BLOBGarbageColelction and Open it.
• Look for repository id as shown in below screenshot
  
  
  
• Use oak-run resetclusterid command

java -jar oak-run.jar resetclusterid crx-quickstart/repository/segmentstore

      where - Download Oka version based on the Repo version of AEM server

• Go to JMX console : http://localhost:4502/system/console/jmx
• Search for BLOBGarbageColelction and Open it and validate the repository id , this should be different.
• That's it!.

How to run online and offline Consistency Check in AEM through JMX console

Statement : Online consistency check for BLOB GC

Solution :
Online Consistency Check :

• Go to the JMX console : http://localhost:4502/system/comsole/jmx
• Search for BLOBGarbagecollection and open it.
• Click on checkConsistency() and click on invoke 
• Observe the log files for the GC observation

Post consistency check you might see Blob id's missing

• Check the log file for the missing Blob id and run  the offline datastore check command to find the missing blobid

Offline Consistency Check:

Managing AEM Datastore adobe official document

Follow the below adobe document:

https://helpx.adobe.com/content/dam/help/en/experience-manager/kt/eseminars/gems/aem-managing-aem-datastore/_jcr_content/main-pars/download_section/download-1/managing_aem_datastoreoct17.pdf