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Title
NetVault workaround for VMware CBT issue (KB 2090639) -
Description
VMware has identified a fault in their tracking of changed blocks if the virtual disk (vmdk) has been extended in size by 128 GB or more. This includes a single extension or multiple extensions that add-up to 128 GB or more.
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Cause
The VMware CBT function QueryChangedDiskAreas command returns incorrect sectors after extending virtual machine vmdk file. A fix is expected in a future ESXi patch.
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Resolution
Workaround
After extending a VMDK beyond 128 GB you must reset Changed Block Tracking (CBT). This can easily be done using NetVault’s VMware plugin version 2.7 or higher by selecting the right-click option on the browse screen and choose ‘Reset CBT’ at the VM level. On versions prior to 2.7 please use the manual process documented at SOL87631
Additional Information
See VMware KB article # 2090639