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ESXi machine: "The parent virtual disk has been modified since the child was created"

Posted on 2014-09-09
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Last Modified: 2014-09-16
One of my virtual servers gives me this error when I start it:

"A general system error occurred: 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"

These are the files in its folder:

SIA-KB-01-000001-delta.vmdk  SIA-KB-01.vmxf
SIA-KB-01-000001.vmdk        vmware-10.log
SIA-KB-01-Snapshot1.vmsn     vmware-11.log
SIA-KB-01-flat.vmdk          vmware-12.log
SIA-KB-01.nvram              vmware-13.log
SIA-KB-01.vmdk               vmware-14.log
SIA-KB-01.vmsd               vmware-15.log
SIA-KB-01.vmx                vmware.log


Can I do something to fix it?
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Question by:ltpitt
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
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Have you started this VM without the attached snapshot?

You will need to adjust the CID values in the the vmdk files.

See this VMware KB Article

Resolving the CID mismatch error: The parent virtual disk has been modified since the child was created (1007969)

However, there is a possibility of disk corruption, and a corrupt VM or data disk.
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by:ltpitt
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Yes I've tried and sadly it lead me to an unbootable machine (I had backupped before trying so I tried accurately inserting correctly CID values various times)

Sadly yes: the VM was started directly from the main disk instead of using the snapshot disk :(
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by:Andrew Hancock (VMware vExpert / EE MVE)
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If you start the VM without the snapshot attached, there is a risk of corruption, when the parent and child do not match.
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by:ltpitt
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I was able to get the "original" parent from a backup and, after restoring it, I've started the VM using the snapshot disk: PERFECT! :D
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