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Powering on VM  fails with error:Thin/TBZ disks cannot be opened in mutlwriter mode

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ontap-9
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san
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Applies to

  • Ontap 9.x
  • ESXi
  • Thin provisioned Lazy/Eager zeroed

Issue

  • Powering on the virtual machine fails with below error:

Reason: Thin/TBZ disks cannot be opened in multiwriter mode..
Cannot open the disk '/vmfs/volumes/xxxxxxxx-xxxxx-xxxxxxxxxxxxxxx/Windows Server 2008/VM.vmdk' or one of the snapshot disks it depends on.
VMware ESX cannot open the virtual disk, "/vmfs/volumes/xxxxxxxx-xxxxx-xxxx-xxxxxxxxxxx/Windows Server 2008/VM.vmdk" for clustering. Please verify that the virtual disk was created using the 'thick' option

  • Lazy zeroed to eager zeroed conversion initiated along with disk extension
  • Snapshots were taken after the disk extension , before the conversion completed
  • As the conversion taking longer time , snapshot created and clone taken out of it and mapped, unable to power on the VMs.

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