So I got this error message today:
Cannot use CBT: Soap fault. A specified parameter was not correct. . deviceKeyDetail: ‘<InvalidArgumentFault xmlns=”urn:internalvim25″ xsi:type=”InvalidArgument”><invalidProperty>deviceKey</invalidProperty></InvalidArgumentFault>’, endpoint: ”
Virtual machines running on ESX/ESXi hosts can identify and track disk sectors that have changed. This feature is called Changed Block Tracking (CBT)
After much research and trying to manually fix this, I came across the following solution which turned out to be easier than I thought! What we need to do is reset CBT as VMs are processed without CBT typically and in this instance the blocks arent being identified.
Thanks to http://www.veeam.com/kb1113 for the images/resolution.
1. Power off the VM
2. Right click the VM, click “Edit settings”, find the “Options” tab and click “Configuration Parameters”
3. Set the “ctkEnabled” value to false
4. Set the “scsi0:x.ctkEnabled” value to false for each disk of the VM in question
5. Open the source folder and remove any -CTK.VMDK files
6. Power on the VM and power it off again
7. Set the “scsi0:x.ctkEnabled” value back to true for each disk of the VM in question
8. Power the VM on