Clear Change Block Tracking Index of VM

Posted on 2011-04-19
Last Modified: 2012-05-11
I have backup software that uses CBT but I have recently clear all the backups and started with a new target. What happens is the software does not realize it should backup the whole machine the first time because it is still reading the CBT and only backing up the blocks that have changed.

Is there a way to reset the CBT on a VM back to 0 or whatever?
Question by:RickEpnet
    LVL 116

    Accepted Solution

    Yes, there is.

    Firslty you must disable and then re-enable it.

    See here, and delete the vmname-ctk.vmdk (ctk files) (or safer just rename)
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    it's the CTK file which tracks the blocks.
    LVL 14

    Author Comment

    hanccocka thanks. looks like that may be correct I will run some tests and if everything checks out ok I will award the point.
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    Thanks, that's how we enable and disable!

    We've also got tools that track the data changes! But we've not documented them for general release. Some day, when we get time. So you can check how much the VM is changing on a daily basis in MBs and GBs.

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