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VMware has released patches for ESXi 6.0 and 6.7 to address an issue related to corruption of CBT data during reverts of Snapshots. This is a critical fix as it prevents the loss of important backup data. In this blog post, we will provide an overview of the issue, the fixes, and how Veeam Backup & Replication works transparently with the fix from VMware.

Issue Overview

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Corruption of CBT (Change Block Tracking) data can occur when reverting a SnapShot in ESXi 6.0 and 6.7, leading to the loss of critical backup data. This issue was first identified a few months ago and has now been addressed by VMware with the release of two patches: one for ESXi 6.0 (November) and another for ESXi 6.7 (last week).

The anatomy of CBT and its importance in backup data

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CBT is a feature in vSphere that allows for efficient incremental backups by tracking changes made to virtual disk files. It is a critical component of backup solutions, as it ensures the integrity of backup data. When a SnapShot is reverted, CBT data may become corrupted if certain conditions are met, leading to the loss of important backup data.

The fixes for the issue

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VMware has released two patches to address the issue: one for ESXi 6.0 (November) and another for ESXi 6.7 (last week). The patches can be found on the VMware KB article related to the issue. The description of the issue and the detail of the fix are listed below:

* ESXi 6.0 Patch Release: https://kb.vmware.com/s/article/71155

* ESXi 6.7 Patch Release: https://docs.vmware.com/en/VMware-vSphere/6.7/rn/esxi670-201912001.html

The patches resolve the issue by updating the CBT code to ensure that it remains stable and consistent, even during SnapShot reverts. The updates also improve the overall stability of vSphere, which is essential for reliable backup solutions.

Veeam’s transparency with the fix from VMware

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Our SVP of Product, Anton Gostev, highlighted the patches in his Weekly Forum Digest, which is a must-follow for all Veeam customers and partners. Additionally, Veeam has confirmed that Veeam Backup & Replication works transparently with the fix from VMware, ensuring that our customers can continue to rely on our solution for their critical backup needs.

Conclusion

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In conclusion, the release of these patches by VMware is a significant development in addressing the issue related to CBT data corruption during SnapShot reverts. The fixes are essential for maintaining stable and reliable backup solutions, particularly for organizations that rely on vSphere for their critical data. We encourage all Veeam customers to apply the patches as soon as possible to ensure the integrity of their backup data.