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marius roma
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The content ID of the parent virtual disk does not match ...

Post by marius roma » Jun 07, 2018 8:25 am

I had to restore several VMs and the restore terminated successfully.
However, when I try to power on the VMs I get errors like:

An error was received from the ESX host while powering on VM <My_VM_Name>.
Failed to start the virtual machine.
Cannot open the disk '<path_to_my_VMDK>.vmdk' or one of the snapshot disks it depends on.
The parent virtual disk has been modified since the child was created. The content ID of the parent virtual disk does not match the corresponding parent content ID in the child
Module DiskEarly power on failed.
Cannot open the disk '<path_to_my_snapshot>.vmdk' or one of the snapshot disks it depends on.
The parent virtual disk has been modified since the child was created. The content ID of the parent virtual disk does not match the corresponding parent content ID in the child


As the problem occurred on more VMs at the same time I need to clarify:
  • Is there any possible mistake in our backp procedure?
  • Is there any possible mistake in our restore procedure?
  • Is there any simple procedure to fix the error?
  • How can I ensure my boss that we can restore VMs from backup in case of need?
Regards
marius

Andreas Neufert
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Re: The content ID of the parent virtual disk does not match

Post by Andreas Neufert » Jun 07, 2018 9:22 am 1 person likes this post

Hard to say. Please contact our Support immediately, they can help to analyse this. Depending on how important the reaction time is, set a Severity 1-3 (it is explained on the support page next to it).

Andreas Neufert
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Re: The content ID of the parent virtual disk does not match

Post by Andreas Neufert » Jun 07, 2018 9:25 am 1 person likes this post

by any chance, did you have restored the VM files and registered the VM on your own, or did you have used the VM restore wizard.

Another option could be to use Instant VM Recovery to start the VM and then migrate the data. Specifically if this is a time critical case.

marius roma
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Re: The content ID of the parent virtual disk does not match

Post by marius roma » Jun 08, 2018 10:36 am

I performed several attempts to restore the VMs with no success.
I solved the problem for one VM by manually editing the .vmx file and for the other VM by using instant recovery and cloning the VM.
Should say that instant recovery is the way to solve this kind of problems?
Given the backup of dozens of VMs, how can I detect if they can be restored without restoring them?
Regards
marius

Andreas Neufert
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Re: The content ID of the parent virtual disk does not match

Post by Andreas Neufert » Jun 08, 2018 10:46 am 1 person likes this post

Look at SureBackup for the verification tests.
Why did you have cloned the Instant VM Recovery VM?

Anyway please let out support have a look, they should find the root cause of the issue.

Andreas Neufert
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Re: The content ID of the parent virtual disk does not match

Post by Andreas Neufert » Jun 08, 2018 10:46 am 1 person likes this post

Please share the support ID here.

marius roma
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Re: The content ID of the parent virtual disk does not match

Post by marius roma » Jun 08, 2018 1:11 pm

Do you mean "ref:_00D30RWR._5000e1KzFGk:ref"?

About SureBackup, I read that "The recovery verification functionality is available in the Enterprise and Enterprise Plus Editions of Veeam Backup & Replication. If you use the Standard Edition, you can manually verify VM backups with Instant VM Recovery.": does it mean that I should perform Instant VM recovery for each VM after backup?

Regards
marius

marius roma
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Re: The content ID of the parent virtual disk does not match

Post by marius roma » Jun 08, 2018 2:08 pm

Andreas Neufert wrote: Why did you have cloned the Instant VM Recovery VM?
I apologize for the very basic question: can I migrate the Instant VM recovery VM without compromising my backup?
Regards
marius

veremin
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Re: The content ID of the parent virtual disk does not match

Post by veremin » Jun 08, 2018 3:27 pm

Correct, you just need to migrate recovered VM to production, as described here. Thanks.

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