![]() How to Enable Change Block Tracking for Virtual Machineġ. All type of Virtual disk(Thick,thin and RDM virtual compatibility Mode) but RDM in Physical Compatibility mode is not supported.Ĥ.No existing snapshot available for the virtual Machineĥ.Virtual Machine should be in Power off state. VM hardware version should be 7 or laterģ. ESX/ESX host must be version 4.0 or laterĢ. Prerequisites to Enable CBT on the virtual Machineġ. Virtual Machine disk can be of any type thick or thin provisioned disk. Backup applications can use the API to query the VMkernel to return the data block information that have changed since the last backup. The CBT feature can be accessed by third-party backup applications as part of vStorage APIs. When backup software perform the backup of the virtual machine, it will request the transfer of only the blocks that changed since the last incremental backup. ![]() Virtual disk blocks are tracked in the virtualization layer and virtual machines are not aware about this disk block tracking. There are many backup software’s including VMware Data Recovery and HP data protector etc uses this technology to take incremental backups of the virtual machine.Change Block Tracking helps the virtual machines can track disk sectors that have changed. ![]() ![]() ![]() Diff VCenter 5.5 appliance and vCenter on WIndowsĬhange Block Tracking (CBT) is a feature of VMware that helps to perform incremental backups for the virtual machines. ![]()
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