Checking and setting CBT for VMware image backups

Using change block tracking greatly improves VM image backup time. To ensure Avamar is using the feature you must both check the option to use it in the dataset and ensure it is turned on in VMware.

To validate it's enabled on your VMs you can use proxycp.jar

•  java -jar proxycp.jar --cbtstatus  | grep -E "VM Name|CBT"
• add the --vm VMname flag to check a single server

If you would like to try and enable it on all VMs:

• java -jar proxycp.jar --cbtstatus --enablecbt

Avamar will attempt to enable it on all VMs it has registered. If the VMware hardware level is too low to support CBT it will just error out in VMware.