Title: Backup Success with CBT Failure: Handling Full Resend of VM Data in BDRSuite

KB ID: 105070

Summary:

This knowledge base article addresses the scenario where a backup operation is reported as completed successfully, but Change Block Tracking (CBT) fails for a specific VM in BDRSuite. This situation arises due to multiple configurations of the same source VM for backup or replication jobs, leading to CBT tracking failure.

Cause:

The mentioned remarks, "Backup Completed Successfully but CBT failed for this VM," occur when a VMWare backup or replication job finishes with this outcome. This arises from configuring the same source VM multiple times for backup or replication tasks, resulting in CBT tracking failure.

Solution:

To address this issue, follow these steps:

1. Handling CBT Failure:

1. When a VM encounters CBT failure, the subsequent incremental backup or replication will automatically be treated as a full backup/replication for that specific VM.
   
2. The CBT Driver will initiate tracking changes from a particular timestamp, ensuring accurate synchronization.
   

Note: This solution is provided to address the situation where backup operations show success but encounter CBT failure for a specific VM in BDRSuite. By allowing subsequent incremental as full backups and resetting CBT tracking, the issue can be resolved to ensure proper data synchronization.

• Related Articles

• Troubleshooting CBT_FAILURE in BDRSuite

  KB ID: 104012 Cause: The CBT (Changed Block Tracking) driver in BDRSuite may become unresponsive due to environmental problems or handle/memory leaks. Additionally, high levels of I/O can lead to extended snapshot quiescing, potentially causing ...

• VMware Backup Failure: Unable to Retrieve queryChangedDiskAreas

  KB ID: 105017 Issue: During VMware backups, encountering the error message "Unable to retrieve queryChangedDiskAreas even after CBT query retry" indicates a failure to track Changed Blocks of a virtual machine (VM) within BDRSuite. Cause: The error ...

• How to Manually Delete the Full Backup Data from BDRSuite Backup Server

  KB ID: 115040 Introduction: In certain scenarios, you may need to manually delete previous full backup data from the BDRSuite Backup Server Web Console. This Knowledge Base article provides step-by-step instructions on how to perform this task. Steps ...

• Troubleshooting VM Snapshot Operation Failure in BDRSuite

  KB ID: 105009 Summary: This knowledge base article addresses the issue of VM snapshot operation failure in Vembu-VMBackup. When encountering this error message, the backup process may fail due to reasons related to snapshot file size exceeding ...

• Backup completed successfully for Guest machine(A full scan was taken owing to CBT failure)

  KB ID: 104049 Issue: Backup Completed Successfully for Guest Machine - Full Scan Triggered Due to CBT Failure Cause: This alert occurs when a full scan of the disks (non-CBT mode) is performed before an incremental Hyper-V backup. The incremental ...