Veeam Support Knowledge Base
Changed block tracking cannot be enabled: one or more snapshots are present

Changed block tracking cannot be enabled: one or more snapshots are present

KB ID:	3169
Product:	Veeam Backup & Replication
Version:	10
Published:	2020-05-06
Last Modified:	2021-08-17

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Challenge

After upgrade to Veeam Backup & Replication 10, the Backup of a VM using Cisco HyperFlex Snapshots completes with the warning "Changed block tracking cannot be enabled: one or more snapshots are present" if a Sentinel snapshot is already present.

The described issue with Cisco HyperFlex Snapshots was resolved in Veeam Backup & Replication v11.

Cause

Veeam Backup & Replication does not enable CTK during backup from Cisco HX for vSphere 6.5 and later hosts; as in this case, VMware may return incorrect CBT data.

Solution

Purpose and applicability of article

This article's solution applies only to environments where Cisco Hyperflex integration is in use. If this warning occurs in an environment not using Cisco Hyperflex, it indicates that a snapshot is present on the VM for which the warning occurs. The presence of that snapshot is preventing Veeam Backup & Replication from enabling vSphere native Change Tracking. In such a situation, Veeam Backup & Replication cannot leverage VMware vSphere CBT but fails over to Veeam’s proprietary filtering mechanism.

As a workaround, please add the following registry key on the server where the Veeam Backup & Replication is installed:

Key Location: HKLM\SOFTWARE\Veeam\Veeam Backup and Replication\
Value Name: VMware65CbtSnapshotCheckEnabled
Value Type: DWORD (32-bit) Value
Value Data: 0

Note: Though the registry value name states VMware 6.5, it is effective on all newer versions of VMware.

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