How to get disk changed areas from CBT(changed block tracker) in VMware

KB ID: 2092
Published: 2016-01-29
Last Modified: 2021-10-20
Get weekly article updates
By subscribing, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.

Cheers for trusting us with the spot in your mailbox!

Now you’re less likely to miss what’s been brewing in our knowledge base with this weekly digest

error icon

Oops! Something went wrong.

Please try again later.

Purpose

How to get disk changed areas from CBT(changed block tracker) in VMware

Solution

The steps detailed on this page involve the usage of the Managed Object Browser and are considered an advanced troubleshooting technique. Great care should be taken when interacting with the Managed Object Browser.

Start by identifying the Managed Object Reference-ID (MORef-ID) of the VM.

If the VM is being protected by Veeam Backup & Replication, navigate to the log directory on the Veeam Server (%programdata%\Veeam\Backup). Within that directory, find the folder that is named after the job that the VM is protected by. Within the job folder will be a log named Task.<vmname>.<Ref-ID>.log
 
If the Ref-ID starts with “vm-“ the job is connecting to the vCenter server.
If the Ref-ID is just a number, the job is connecting to a standalone host.
 

  1. Now using an web browser navigate to: https://<vc/host ip>/mob/?moid=<Ref-ID>
     
    Example for VC: https://abp-vc.abp.lab/mob/?moid=vm-688
    Example for host: https://esxi1.abp.lab/mob/?moid=26

  2. Create a snapshot for the virtual machine, and note that snapshot ref-id on the MOB page.

  3. On the MOB page for the VM click "QueryChangedDiskAreas"

    User-added image

  4. Insert the following parameters:

    snapshot reference id
    device key of a virtual disk
    start offset (the beginning of the required changed area)
    change id (use "*"(star symbol) to query all used space)

    User-added image

  5. Click "Invoke Method" and then result will be shown at the bottom in the same window.

    The table contains changed disk areas start offsets and lengths.

    User-added image
Click here to send feedback regarding this KB, or suggest content for a new KB.
To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.

Spelling error in text

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Thank you!

Thank you!

Your feedback has been received and will be reviewed.

Oops! Something went wrong.

Please try again later.

KB Feedback/Suggestion

This form is only for KB Feedback/Suggestions, if you need help with the software open a support case

By submitting, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Verify your email to continue your product download
We've sent a verification code to:
  • Incorrect verification code. Please try again.
An email with a verification code was just sent to
Didn't receive the code? Click to resend in sec
Didn't receive the code? Click to resend
Thank you!

Thank you!

Your feedback has been received and will be reviewed.

error icon

Oops! Something went wrong.

Please try again later.