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Chris
Asked: 2014-05-23 10:37:23 +0800 CST

Change Block Tracking settings not retained for a VM on VMWare 5.5

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I'm trying to enable Change Block Tracking as per this VMWare KB article but the setting ctkEnabled is not being retained in the advanced options or being added to the vmx file.
The setting scsi0:0.ctkEnabled is being retained and I see a file vmname-ctk.vmdk in the datastore. I've verified that the vm doesn't have any snapshots but don't see any other suggestions in the KB (or google, of course.)

Edit:

The last comment on this community post. It's a slightly different circumstance, but suggests that there is an known bug editing these settings in the web-gui.

vmware-esx

2 Answers

  1. Have you checked the prerequisites here?

    Also, can you explain at which stage the setting disappears, e.g.: immediately after configuring, Etc.?

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  2. One VM doesn't work, but many others do? This is really a troubleshooting exercise that we may not be able to help you with... Granted, I've never needed to do this as VMware's vSphere Data Protection adds this to the virtual machine configuration automatically.

    You could just add the requisite lines to the offending VM's configuration file manually.

    ctkEnabled = "TRUE"                               
scsi0:0.ctkEnabled = "true"

    Things that help to know in general:

    • Version of ESXi/build number (because: bugs, and most people don't keep their VMware updated).
    • Is this a vSphere cluster or standalone host?
    • What is different about the VM causing the problem?
    • Do you have any snapshots present on this VM?
    • Are you using the .NET vSphere client? The vSphere Web Client?
    • What is the version of the actual virtual machine? vmx-10, vmx-09, 8, 7?
    • How did you enable this feature on the other VMs?
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