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Unable to power on a virtual machine after a volume resignature
Symptoms
Some virtual machines fail to boot after
Virtual machines stored on a datastore that was not resignatured fail to boot
Resolution
The disks for the virtual machines are stored on different datastores than the datastore for the virtual machine itself.
While the VMFS where the virtual machine is stored has not been resignatured, the VMFS where the disks are stored has been resignatured. This mean the virtual machine still references the old VMFS UUID to access the disk.
To ensure the virtual machine references the new VMFS UUID:
Unregister the virtual machine from VirtualCenter.
Open a console session to the ESX host.
Make a backup copy of the VMX file.
Update the path to the VMDK with the new UUID in the VMX file.
Register the virtual machine in VirtualCenter.
Power on the virtual machine.
Warning: While it is possible to reconfigure the disk from the graphical interface, it presents only the base disk and not the delta file if the virtual machine has a snapshot. Thus it boots from the base disk and corrupts the snapshot chain.
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